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JEE · NEET Previous Year Question

The correct order of reactivity of aldehydes and ketones towards hydrogen cyanide is

Topic: JEE PYQ

Answer: D. Full step-by-step solution below.

  1. A
  2. B
  3. C
  4. D

Correct answer: D

Solution

(d) : Alkyl group attached to carbonyl carbon increases the electron density on the carbonyl carbon and lowers its reactivity towards nucleophilic addition reactions.
Also, as the number and size of alkyl group increases, the attack of nucleophile on the carbonyl group becomes more and more difficult due to steric hindrance.
Hence, the reactivity order will be :

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