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NEST2020ChemistryAldehydes and Ketones

Aldehydes and ketones react with hydrogen cyanide to form cyanohydrins. It is an addition reaction catalysed by a base. The correct statement with respect to this reaction is:

Options

  1. AThe base reacts with hydrogen cyanide to form a conjugate base that is the nucleophile.
  2. BPure hydrogen cyanide alone can react completely with the carbonyl group
  3. CThe base is also a nucleophile and attacks the carbonyl group.
  4. DHydrogen cyanide first protonates the carbonyl group to form the conjugate acid which reacts further.

Correct answer

A. The base reacts with hydrogen cyanide to form a conjugate base that is the nucleophile.

Step-by-step solution

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