Chemistry-Nucleophilic Addition
NEET Chemistry Nucleophilic Addition Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 12
Assertion (A): Aldehydes and ketones react with hydrogen cyanide to form cyanohydrins, with cyanide ion acting as a stronger nucleophile than pure HCN. | Reason (R): The nucleophilic addition of hydrogen cyanide is catalyzed by a base to generate cyanide ions.
A
Both (A) and (R) are true and (R) is the correct explanation of (A).
B
Both (A) and (R) are true but (R) is not the correct explanation of (A).
C
(A) is true but (R) is false.
D
(A) is false but (R) is true.
Correct Answer
Option A
Detailed Explanation
The NCERT context states that hydrogen cyanide reacts very slowly with aldehydes and ketones, and the reaction is catalyzed by a base to generate cyanide ions, which are stronger nucleophiles, forming cyanohydrins.
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