Which of the following statements is not true regarding acid-catalysed hydrolysis of carboxylic esters?

Protonation of the alkoxy oxygen of the tetrahedral intermediate facilitates elimination of the alcohol.

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Protonation of the carbonyl oxygen enhances its electrophilicity.

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Hydroxide ion adds to the protonated carbonyl group.

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The initially formed protonated carboxylic acid is deprotonated to give the final product.

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Solution

The correct option is B Hydroxide ion adds to the protonated carbonyl group.
In the given reaction, Hydroxide ion didn't add to the protonated carbonyl group.
Water molecule added to the protonated carbonyl group. Remaining all are true according to the above mechanism.

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Similar questions

Select the correct statements regarding zwitterion.

(i) Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules.
(ii) A zwitterion can act either as a proton donor or proton acceptor.
(iii) A monoamine monocarboxylic

α

-amino acid is a acid at high pH as both the groups (amino and carboxyl) lose a proton.
(iv) Amino acids in solution at neutral pH exist predominantly as dipolar ions, the amino group is protonated

(N H_{3}^{+})

and the carboxyl group is deprotonated

(- C O O^{-})

Which of the following statement is true regarding esterification of a carboxylic with an alcohol ?

(i) It is carried out in presence of a strong acid which acts as a catalyst.

(ii) The strong acid makes the carbonyl carbon more electrophilic, and hence causes the alcohol, a strong nucleophile to attack on the carbonyl carbon.

(iii) The strong acid makes the carbonyl group more electrophilic which is thus attacked easily by an alcohol. a weak nucleophile.

(iv) Esterification can be done even in absence of a strong, acid.

Q. The ions produced by donation of proton from carboxylic acid is called:

Q. In Cannizzaro reaction given below:

P h - C H O O H^{-} - -- \to P h - C H_{2} - O H + P h C O O^{-}

The slowest step is:

Q. Protonation of carbonyl group forms a cation with significant charge on the carbon atom

How many of the following carbonyl compounds form an aromatic cation only after protonation?

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Which of the following statements is not true regarding acid-catalysed hydrolysis of carboxylic esters?

The correct option is B Hydroxide ion adds to the protonated carbonyl group.In the given reaction, Hydroxide ion didn't add to the protonated carbonyl group.Water molecule added to the protonated carbonyl group. Remaining all are true according to the above mechanism.

The correct option is B Hydroxide ion adds to the protonated carbonyl group.
In the given reaction, Hydroxide ion didn't add to the protonated carbonyl group.
Water molecule added to the protonated carbonyl group. Remaining all are true according to the above mechanism.