Imine formation using an aldehyde/ketone and primary amine …

Chemistry Aldehydes, Ketones & Carboxylic Acid NTA Abhiyas Question - Aldehydes and Ketones Single Correct MCQ

Published on: August 12, 2026

Imine formation using an aldehyde/ketone and primary amine is acid-catalyzed, yet the rate drops below pH 4.5. Why does the rate drop below this pH?

The carbinolamine intermediate is stable at low pH

The imine product is hydrolyzed at low pH

Protonation of the amine decreases its nucleophilicity

The amine is hydrolyzed at low Ph

Text Solution

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The correct answer is:

Imine formation:

The reaction is possible pH 4 to 5 only. Hence, the reaction is pH dependent.

At very low pH (high cone, of H + ): ammonia derivative will form their respective salts due to their basic nature and at the same time will lose their nucleophilic nature.

At very high pH (high cone, of OH - ): carbonyl group will not be able to undergo sufficient protonation.

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