Phenol is less acidic than ethanol
Phenol is less acidic than ethanol. Which is more acidic, p-methylphenol or phenol? why? Why is water more acidic than ethanol but slightly less acidic than methanol? Explain the acidity trend of alcohols: 1" >2 >3. CH 2 OH), which is a typical aromatic alcohol. Phenol is more acidic than ethyl alcohol. Because of these two effects - N O2 group is electron withdrawing in nature. The correct option is B o - nitrophenol. Hence phenol is more acidic than ethyl alcohol. Phenol is more acidic than ethanol because (a) greater resonance stabilization of phenoxide ion (b) phenol has greater H-bonding than ethanol (c) phe…. Phenol is more acidic than alcohol as it readily gives. Mar 25, 2019 · Mar 27, 2019 Vikash Kumar. 1) R O H + O H − ⇌ R O − + H O H. It is a combustible solid (NFPA rating = 2). Jul 21, 2023 · The correct Answer is:5. (ii) The reaction of phenol with sodium hydroxide to give sodium phenoxide and water. (iii) (CH 3) 3 C—O—CH 3 on reaction with HI gives (CH 3) 3 C—I and CH 3 —OH as the main products and not (CH 3) 3 C—OH and Sep 14, 2018 · Presence of these groups at ortho or para positions of phenol decreases the acidic strength of phenols. Alcohols are weaker acids tha phenol. While in ethanol, ethyl group has a + I effect and increases the electron density around H of O—H group making it difficult to remove H as H +. Note: All the other aromatic compounds i. `p`-Methylphenol Jul 21, 2023 · The reaction of phenol with aqueous NaOH indicates that phenols are stronger acids than alcohols. 4. However, the differences among the pK a s of the alcohols are not large. Conclusion: Acetic acid and p-nitrophenol are more acidic than phenol, while p-methoxyphenol and ethanol are less acidic than phenol. (iii) (C H 3) 3 C − O − C H 3 on reaction with HI gives (C H 3) 3 C − I a n d C H 3 − O H as the main products and not (C H 3) 3 C − O H a n d C H 3 − I. A hydrogen ion can break away from the -OH group and transfer to a base. The smaller the pKa value, the more acidic the compound. Consider the acidity of 4-methoxyphenol, compared to phenol. This requires a In phenol, pulling the $\mathrm{p}_z$ electrons from the oxygen atom into the ring causes the hydrogen atom to be more partially positive than it is in aliphatic alcohols. The acid ionization constant (Ka) of ethanol is about 10~18, slightly less than that of water. The answer is the option (ii). ERG (like − C H 3 ) destabilizes the phenoxide ion and hence, acidity decreases but an EWG (like − N O 2 g r o u p ) stabilizes the phenoxide ion and hence increases the acidity. Correct Answer - B. Phenol is less acidic than o - nitrophenol as electron withdrawing (−N O2) group increases the acidity of phenols while electron donating groups (−CH 3,−OCH 3) decrease the acidity of phenols. For example, in solution in water: Phenol is a very weak acid and the position of equilibrium lies well to the left. Assertion and reason both are correct and reason is correct explanation of assertion. Nov 21, 2023 · Reason : Lewis acid polarises the bromine molecule. Feb 1, 2021 · The larger the Ka value the more acidic the compound as the [products]> [reactants and H+ ions and the carbanion formed=products. Their relative acid–base properties can be used to separate Jun 14, 2022 · Question 68. Phenol is less acidic than (a) acetic acid (b) p-methoxyphenol (c) p-nitrophenol (d) ethanol. Presence of these groups at ortho or para positions of phenol decreases the acidic strength of phenols. Nitro group is a electron withdrawing group. Presence of electron donating group (methoxy) in p-methoxyphenol makes it acidic than phenol. Homogeneous mixtures of phenol and water at phenol to water mass ratios of ~2. The OH group of phenol is indeed more polarized - and a stronger acid - than the OH group of an aliphatic alcohol - maybe that is what you are asking. Alcohols, such as ethanol, can be deprotonated to form its conjugate base by reaction with a stronger base, such as sodium amide (NaNH 2 ), sodium hydride (NaH), or Grignard reagents (RMgBr). Methanol D. Alcohols, like water, are both weak bases and weak acids. (i) Both ethanol and phenol are weak acids the ethanol is less acid then phenols because when phenol is dissolved in water it produce phenoxide ion by losing of proton and the phenoxide ion is stabilised by resonance. In ethanol, the negative charge on the oxygen atom (after the loss of a proton) is stabilized by the electron-donating effect of the ethyl group. Phenoxide ions 3. It is because the phenoxide ion left after the release of proton is stabilised by resonance but not the alkoxide ion. The o -, m -, and p -cresols are monohydroxytoluenes (CH 3 . p-Nitrophenol. ∝. Phenols are more acidic than alcohols. Question. Assertion: Ethanol is a weaker acid than phenol. Instead, it can be deprotonated by hydroxide, unlike an alcohol. Compounds with a smaller K a and larger pK a are less acidic, whereas compounds with a larger K a and smaller pK a are more acidic. An important example is salt formation with acids and bases. Deprotonation of phenol gives phenoxide ion which is resonance stabilized. (2) The C-O-H bond angle in alcohols is slightly less than the tetrahedral angle (${109^ \circ }28'$): In C-O-H the oxygen atom contains 2 bond pairs and 2 lone pairs which are oriented in a tetrahedral shape around oxygen. Although phenol is a million-fold higher in acidity than ethanol, it is a hundred thousand-fold less acidic than acetic acid. Resonance 2. Several important chemical reactions of alcohols involving the O-H bond or oxygen-hydrogen bond only and leave the carbon-oxygen bond intact. Apr 25, 2020 · Best answer. Reason : Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH. 9 (phenol) vs 10. Formic acid, Benzoic acid, Picric acid, Ethanol, Water, Ortho - nitrophenol, Ortho - cresol, para - nitrophenol, para - cresol by Chemistry experts to help you in doubts & scoring excellent marks in Class 12 exams. C 6 H 5 − O H + N a O H → C 6 H 5 − O N a + H 2 O Phenol is more acidic than ethanol. 2 ( p -methoxyphenol). Aug 8, 2015 · The source you read states that the $\ce{sp^2}$ hybridised carbon in phenol is more electronegative than the $\ce{sp^3}$ hybridised one in (say) ethanol. They have slightly different pKa p K a values of 9. Phenol is less acidic than (A) ethanol (B) o-nitrophenol (C) o-methylphenol (D) o-methoxyphenol Jan 4, 2016 · Since phenoxide is less acidic than ethoxide, if you protonate it, it has a greater tendency to donate the proton away than ethoxide does, making phenol more acidic than ethanol. On the other hand, in o-methylphenol and in o-methoxyphenol and in o-methoxyphenol, electron releasing group ( − CH A 3 − OCH A 3) Carboxylic acids are more acidic than phenol and phenols are more acidic than alcohol. (ii) Phenol is an acid but does not react with N a H C O 3. Carboxylic acids are stronger acids than phenol. 6 days ago · Complete step by step answer: Acidity of any compound generally depends on its tendency to release hydrogen ions. [1] Whatever explanation we might use to explain it, the simple fact is that phenols are more acidic than alcohols. S 3: Ortho- cresol is less acidic than its meta and para isomers. Oct 20, 2021 · Correct Answer - A::C. (ii) The C-O-H bond angle in alcohols is slightly less than the tetrahedral angle (109 ∘ 28 ′). p-Methoxyphenol is weaker than phenol due to (+R and −I) effects. Solution: (c) Phenol is stronger acid than ethanol as phenoxide ion is stabilized by resonance whereas no such stabilization occurs in ethoxide ion. It is due to the effective delocalisation of negative charge in Carboxylic acids are more acidic than phenol and phenols are more acidic than alcohol. Phenol is a weak acid than ethanol. 5. Ethanol B. Presence of electron withdrawing group ( − N O2) ( - N O 2) in p-nitro phenol makes it more acidic than phenol. On the other hand, methoxy group is an electron releasing group. p-Nitrobenzyl alcohol is more acidic than benzyl alcohol but p- methoxybenzyl alcohol is less… A: Acid: It is the ability of a compound to donate protons to other species. Phenol is less acidic than (a) water (b) ethanol (c) p-nitrophenol (d) p-methoxyphenol 01:01 Phenol is more acidic than ethanol because (a) greater resonance stabilization of phenoxide ion (b) phenol has greater H-bonding than ethanol (c) phe… Ethanol is less acidic than water because of the electron donating nature of the alkyl group attached to the oxygen which destabilizes the hydroxide ion and make it tougher for the oxygen to donate the proton. (b) Ethanol, phenol and benzyl alcohol, in the increasing order of solubility. - phenol is too weak to liberate CO2 from Mar 16, 2020 · Acidity of Alcohols. Penta-1-ol, butan-1-ol, butan-2-ol, ethanol, propan-1-ol, methanol. Phenoxide ion is a stronger base than ethoxide. 25, lower than that of trifluoroacetic acid. They both have the same number of resonance structures too. Who are the experts? Mar 28, 2023 · If not, your teacher is absolutely wrong. It decreases electron density on benzene ring and delocalizes negative charge of phenoxide ion. Phenol can lose ion easily because phenoxide ion formed is stabilized to some extent. Explanation: In o-nitrophenol, nitro group is present at ortho position. There are two contributions to this: (1) inductive: the sp2 hybridized carbon participating in the sigma bond to the OH group is more electron-withdrawing than the sp3-hybridized carbon Answer the following : (i) Phenol is more acidic than ethyl alcohol. it is very hard to remove H + from EtOH. There is no resonance stabilization for the deprotonation of ethoxide ion (obtained by Phenol is less acidic than p-nitrophenol. Was this answer helpful? . Ethoxide ion, however, is not stabilised by resonance. Acidity of Alcohols and Phenols. Phenoxide ion is bulkier than ethoxide. Reason: Sodium ethoxide may be prepared by the reaction of ethanol with aqueous \[\ce{NaOH}\]. Hence, O− nitrophenol is more acidic than phenol. Was this answer helpful? Presence of electron withdrawing group at ortho position increases the acidic strength. Chloroacetic acid is more acidic than acetic acid due to Phenol is less acidic than A. Explain why phenol is more acidic than ethanol? Arrange water, ethanol and phenol in increasing order of acidity and give reason for your answer. Let us look at ethanol. Ethoxide ions are not stabilized by resonance and thus Ethanol is less acidic than Phenol. Solution: Phenol are less acidic than carboxylic acid, because carboxylate ion is relatively more stable as compared to phenoxide ion. S 2: Ortho - nitrophenol is less acidic than para - nitrophenol. VITEEE 2007: Phenol is less acidic than (A) p-chlorophenol (B) p-nitrophenol (C) p-methoxyphenol (D) ethanol. 2 g dissolving in 1000 ml (0. 95 in water, while methanol has a pKa of 15. Step 3/3 Therefore, o-methoxyphenol is less acidic than phenol. Phenol shows more acidic character than alcohol and acetylene as its carbanion (phenoxide ion) is quite stable due to resonance. 0) as it has strong electron-withdrawing > C = O group. e. This answer is: 👍 Helpful ( 0 ) 👎 Not Helpful ( 0 ) Feb 15, 2022 · Phenol is less acidic than o-nitrophenol. The order of acidity of various liquid alcohols generally is water > primary > secondary > tertiary ROH. O-methyl phenol, O-methoxy phenol, and O-nitrophenol have the resonance effect. Phenol is more acidic than alcohol. ethanol. So in case of ethanol it is very tough to remove hydrogen ion from it so we can say that ethanol is less acidic than phenol while on the other side phenol is more acidic than ethanol because it can lose the hydrogen ion very easily because delocalization of electrons takes place in May 22, 2024 · So, it is more acidic than O-methyl phenol and O-methoxy phenol. Ethanol can be converted to its conjugate base by the conjugate base of a weaker acid such as ammonia {Ka — 10~35), or hydrogen (Ka ~ 10-38). Phenoxide ion is stabilized through delocalisation. Hence, water is more acidic than ethanol. O-methoxyphenol. O-methylphenol. Use a resonance argument to explain why picric acid has such a low pKa. 00:48. By this we mean that the equilibrium position for the proton-transfer reaction lies more on the side of ROH as R is changed from primary to secondary to tertiary; therefore, tert-butyl alcohol is considered less acidic than ethanol: ROH + OH− ⇌ RO− + HOH (11. Notice that the methoxy group increases the Solution. 10) Phenol is less acidic than a) Ethanol b) O-nitrophenol c) O-methylphenol d) O-methoxyphenol Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. Correct option is C. More ability to gain a proton Practice questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, NCERT Exemplar Questions and PDF Questions with answers, solutions, explanations, NCERT reference and difficulty level Arrange the following as directed : (a) Ethanol, phenol, p-cresol and p-nitrophenol, the increasing order of acidity. It increases acidity. On the other hand, in o-methylphenol and in o-methoxyphenol, electron releasing group (- CH3, - OCH3) are present. The explanation for the incorrect answer (A) Formic acid . Sep 16, 2022 · Phenol is less acidic than _____. Phenol is an organic compound appreciably soluble in water, with about 84. My guess is that the resonance structure for p -methoxyphenol with the lone pair on the para carbon contributes less to the stabilisation of the negative charge since it's in an electron rich Solution. JIPMER 1995: Phenol is less acidic than: (A) acetylene (B) p-methoxy phenol (C Aug 2, 2019 · 0. Q. The sodium salt of phenol, sodium phenoxide, is far more water-soluble. p-Nitrophenol is a stronger acid than phenol due to − R and − I effects. So it reduces electron density on the benzene and hence benzene abstracts electron from H and releases it as H 2. Therefore the conjugate base of phenol is more stable than that of ethyl alcohol. Explain why p-nitrophenol is more acidic Ethanol cannot benefit from such an effect, and thus the conjugate base is less stable than that of phenol and it is less acidic. Correct option (a) acetic acid (c) p-nitrophenol. Phenol is more acidic than that of ethanol because: phenoxide ion is less stable than ethoxide; phenoxide ion is bulkier then ethoxide; phenoxide ion is stabilised through delocalisation; phenoxide ion is stronger base than ethoxide Phenol and Ethanol both are weak acids but Phenol is more acidic as the Phenoxide ion are resonance stabilized. J K CET 2005: Which is not correct? (A) Phenol is more acidic than acetic acid (B) Ethanol is less acidic than phenol (C) Ethanol has higher boiling p. Solution: Phenol is less acidic than o -nitrophenol as electron withdrawing (−N O2) group increases the acidity of phenols while electron donating groups (−C H 3, −OC H 3) decrease the acidity of phenols. Therefore, phenol does not need to be deprotonated with a base as strong as sodium hydride. When we compare these values with those of comparable alcohols, such as ethanol (pK a = 16) and 2-methyl-2-propanol (pK a = 19), it is clear that carboxylic acids are stronger acids by over ten powers of ten! Furthermore, electronegative substituents near the Alcohols, like water, are both weak bases and weak acids. So, the correct option is (A). o-nitrophenol. (iii) Although phenoxide ion has more number of resonating structures than benzoate ino, benzoic acid is stronger acid than phenol . Therefore pKa p K a is also a measure of how stable the conjugate base is. Give two reactions that show the acidic nature of phenol. Answer: Question 16: Answer: Question 17: Give reasons for the following: (i) Phenol is more acidic than methanol. Phenol is the trivial name for monohydroxybenzene. (B). Nitro group is an electron-withdrawing group. Phenol is less acidic than o - nitrophenol as electron withdrawing (−N O2) group increases the acidity of phenols while electron donating groups (−CH3,−OCH3) decrease the acidity of phenols. Nov 27, 2023 · However, phenol is sufficiently acidic for it to have recognizably acidic properties - even if it is still a very weak acid. Check Answer and Solution for above Chem. Acetic acid (ethanoic acid, pKa ≈ 5 p K a ≈ 5) is more acidic than phenol ( pKa ≈ 10 p K a ≈ 10 ), which is reflected in their reactivity with a weak base such as sodium carbonate (adding acetic acid leads to effervescence of carbon dioxide). This effect is more pronounced when such a group is present at ortho and para positions. Here’s the best way to solve it. Phenol is less acidic than? a. Becausre o-Nitrophenol have -I, -M effect producing group on it. So, the electron density in the O - H bond of p - nitrophenol decreases relative to the O - H bond of phenol. (D) o-methoxyphenol: The conjugate base of o-methoxyphenol has a negative charge on the oxygen atom, and the methoxy group is also an electron-donating group, which destabilizes the negative charge. The phenoxide ion obtained after the removal of a proton is stabilized by resonance whereas the ethoxide loan obtained after the removal of a proton is destabilized by +I Effect of − C 2 H 5 group. Hence, phenol is more acidic than ethanol and has lower pKa The pK a 's of some typical carboxylic acids are listed in the following table. The resonance in phenoxide ions stabilizes the negative charge compared to alkoxide ions. In substituted phenols, the presence of electron-withdrawing group such as nitro group enhances the acidic strength of phenol. ← Prev Question Next Jul 20, 2022 · Exercise 7. b. Assertion : o-Nitrophenol is less soluble in water than the m- and p-isomers. (ii) The C—O—H bond angle in alcohols is slightly less than the tetrahedral angle (109°28 ). Give reasons: p-nitro phenol is more acidic than p-methyl phenol. So, phenol is less acidic than acetic acid and p-nitrophenol. Comparing acidities of ethanol, phenol and carboxylic acid. S 4: Generally ortho substituted phenols are less acidic than their coressponding meta & para isomers. Acidic nature of Alcohol: In the case of alcohol, the alkyl group (-CH 3) attached to the alcohol is of electron-donating nature which decreases the electronegativity of the Oxygen atom and makes it less polar and more stable. Phenol is more acidic than ethanol due to - 1. Phenoxide ion is less stable than ethoxide. stability of conjugate base. The phenol derivative picric acid has a pKa of 0. Less -I effect 4. H-atom, therefore, can easily be removed as H + ion. Which leades to high acidic nature. Solution. The decrease in electron density of the O - H bond of p-nitrophenol, the polarity of O - H bond In general, alcohols in aqueous solution are slightly less acidic than water. The acidic substance has the tendency to produce Hion when dissolved in water Both phenol and ethanol are weak acid However the acidity of phenol is more than that of ethanol This is because after losing a proton the phenoxide ion undergoes resonance andgets stabilised whereas ethoxide ion does not. Its pK a is ≈ 9. Why phenol is more acidic than ethyl alcohol? Phenoxide ion in phenol undergoes resonance stabilization. C 6 H 4 OH) and are distinct in their properties and reactions from the isomeric side-chain hydroxy compound, benzyl alcohol (C 6 H 5 . So, phenol is less acidic than o - nitrophenol. It is even less acidic than carbonic acid but more acidic than water. Both alcohols and phenol are weak acid, the alcohols are less acidic than phenol because it is very tough to remove ′H ′ ion from alcohol. Best answer. But the absence of an electron-withdrawing group makes it less acidic than O-nitrophenol. Compare acidity of phenol with that of ethanol. Correct option is B. An acidic substance is something that can produce hydrogen (H +) in water. - aqueous solution of phenol has a pH just below 7, whereas alcohol and water appear neutral with narrow range universal indicator paper. However, if we look at the structures of acetate and phenoxide ions, the delocalization of In this video, we play around with phenol to compare the acidic strength of phenol derivatives - o-cresol and p-cresol. ← Prev Question Next Question →. The acid ionization constant (Ka) of ethanol is about 10~18 Q: 3. 895 M ). - ul0fx6ee Phenol is more acidic than aliphatic alcohol due to the stabilisation of phenoxide ion through resonance. Verified by Toppr. So, phenol is more acidic than ethanol and methanol. Conjugate base of ethanol is ethoxide ion which is not stabilized by resonance: Phenol is more acidic as compared to ethanol because conjugate base of phenol is stabilized by resonance: Option (B): Phenol will be less acidic as compared to o − nitrophenol due to the presence of the electron withdrawing group (− N O 2) in o − nitrophenol. `o`-notrophenol C. Thus option B is the correct one. This is due to the presence of electron-donating or electron-withdrawing groups that can stabilize or destabilize the negative charge on the oxygen atom in the -OH group. Acidity. However, in the gas phase the May 23, 2024 · Phenol is more acidic than that of ethanol because: (A). Jan 23, 2023 · In general, alcohols in aqueous solution are slightly less acidic than water. 1) (11. Thus, phenol is unable to protonate Jul 21, 2023 · S 1: Catechol is less acidic than resorcinol. Phenols are compounds in which a hydroxyl group is bonded directly to an sp 2 hybridized carbon atom of an aromatic ring. This is not surprising because all alcohols are oxy-acids (OH), and the differences in acidities are due to the effect of substituents in the 1-position removed from the acidic site. Step by step video, text & image solution for How many of these compounds are more acidic than phenol here. O-nitrophenol. a. Phenol is less acidic than O− nitrophenol. Phenol is less acidic than o-nitrophenol. This means it is much more easily lost from phenol than it is from aliphatic alcohols, so phenol has a stronger acidic property than ethanol. Phenol is less acidic than o-nitrophenol as electron withdrawing ( − N O2) ( - N O 2) group increases the acidity of phenols while electron donating groups −(C H 3, − OC H 3) - ( C H 3, - O C H 3) decrease the acidity of phenols , Phenols are more acidic than alcohols . (C). Therefore, phenol is a stronger acid than ethanol, On the Therefore, ethanol is less acidic than phenol. 9# Ethanol: #~~15. 0. c. Nitro group of phenol produces - I and - R effect. Problem 1RQ: Define and explain the differences between the following terms. d. \text { Which of the following is/are more acidic than phenol? differences between phenol and ethanoic acid, ethanol and water. Step 4/5 Step 4: p-Nitrophenol is more acidic than phenol because the nitro group is an electron-withdrawing group. Assertion (A): Ethanol is a weaker acid than phenol. As shown in Table 17. (c) Phenol, O-nitrophenol, m-nitrophenol, p-nitrophenol, in the decreasing order of acidic strength. 9# where a lower pKa corresponds to a stronger acid. Step 3: Phenol is also less acidic than ethanol for similar reasons. 0:00 - Introduction to phenol and its acidic strength 00:57 - Writing the conjugate base of phenol (phenoxide) 02:09 - Stability of phenoxide ion 03:47 - Delocalisation in phenoxide ion 05:44 - Comparing the acidic strength of (i) Phenol is more acidic than methanol. Phenol has a pKa of 9. The structure of… Solution: Phenol is more acidic than ethanol due to resonance stabilisation of phenoxide ion. Reason : m- and p- Nitrophenols exist as associated molecules. Nitro groups are very powerful electron-withdrawing groups. The present in phenol is an electron-withdrawing group, so it increases the acidity whereas groups like being electron-donating groups, they decrease the acidity of phenol is less acidic compared to o-nitrophenol from the given options. The acid ionization constant (K a) of ethanol is about 10 18, which is slightly less than that of water. In this video, we learn how to compare the acidic strength of organic molecules just by looking at their structures! Timestamps Introduction - 1:46 How to write conjugate base - 1:47 Acidic hydrogen - 2:07 Comparing the stability of the conjugate base using inductive effect - 3:23 Refresher for electronic effects - 4:26. Presence of electron-withdrawing group at ortho position increases the acidic strength. Sodium ethoxide can be prepared by This makes phenol more acidic than alcohols by stabilising the phenoxide ion. Explain why phenol is more acidic than ethanol? Solution. Therefore, o-methylphenol is less acidic than phenol. Due to this, electron density on oxygen atom decreases and icreases the polarity of O − H bond, which leads to the formation of phenoxide ion. But it is quite weaker acid than acetic acid (pK a ≈ 4. Increasing order of acidity is ethanol < water < phenol. It is more acidic than an alcohol, but less acidic than a carboxylic acid. 1 , simple alcohols like methanol and ethanol are about as acidic as water, but the more highly substituted tert -butyl alcohol is somewhat weaker. So, since it is difficult to extract the hydrogen ion from ethanol, we can assume that ethanol is less acidic than phenol, whereas phenol is more acidic than ethanol because it can quickly lose the hydrogen ion due to electron delocalization by resonance in phenols. (i) ethanol (ii) o-nitrophenol (iii) o-methyl phenol (iv) o-methoxy phenol Answer: The answer is the option (ii). This is as the negative charge on the oxygen atom is delocalized around the ring. So, phenol is less acidic than o Sep 6, 2013 · 26. The electron density of O—H bond then shifts towards oxygen decreases around H-atom. Carboxylic acids are more acidic than phenol and phenols are more acidic than alcohol. Additional Information: Anything which stabilizes the conjugate base will increase the acidity. Phenol is more acidic than ethanol because in phenol, the phenoxide ion obtained on deprotonation is stabilized by resonance which is not possible in case on ethanol. We can see this in their pKas: Phenol: #~~ 9. Jan 15, 2023 · In general, alcohols in aqueous solution are slightly less acidic than water. The acidity of phenol is determined by its electron-withdrawing or donating ability. Reason (R): Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH. An strong acid is that which easily donate Hydrogen ion. (D). The pKa value is 16. This Dec 2, 2015 · 1 Answer. By this we mean that the pK a is reduced as R is changed from primary to secondary to tertiary; therefore, tert-butyl alcohol is less acidic than ethanol. p-Methoxyphenol is weaker than phenol due to ( + R and − I) effects. Assertion : Ethanol is a weaker acid than phenol. In phenol, hydroxyl group directly attach to s p 2 hybridised carbon which withdraw the electron pair of oxygen to wards itself. - phenol is a much weaker acid than ethanoic acid but is more acidic than water or ethanol. Formic acid is more acidic as in Formic acid there is a resonance because of two Aug 9, 2023 · ethanol is less acidic than HCL because HCL easily donate Hydrogen ion where as Ehanol does not donate Hydrogen ion easily. Also carboxylic acids are more acidic than alcohols and phenols as the carboxylate ion is stabilized by resonance. This means, that this carbon has a greater desire to draw electrons towards it. Explanation: Phenol is less acidic than acetic acid and p-nitrophenol. H + to convert into more resonance stable phenoxide ion with a base while. Created by Aanchal Arora. This So, p-nitrophenol is more acidic than phenol. Nov 24, 2023 · Reason : Lewis acid polarises the bromine molecule. p-Nitrophenol is a stronger acid than phenol due to −R and −I effects. Therefore, it is clear that phenol is less acidic than p-nitrophenol. 6 and higher are possible. 1 day ago · Now after this above discussion we have seen that phenol is more acidic than methanol. bo tg vn uh rn ko ze rv ly od