MHT CET 2023 Chemistry question

Identify the reaction in which carbonyl group aldehydes and ketones is reduced to methylene group on treatment with hydrazine followed by heating with sodium hydroxide in ethylene glycol.

(A)Wolf-Kishner reductionCorrect
(B)Clemmensen reduction
(C)Stephen reaction
(D)Etard reaction

Answer: (A)

Solution

In the Wolff–Kishner reduction, the carbonyl compound first forms a hydrazone with hydrazine (), which on heating with NaOH or KOH in ethylene glycol (high boiling solvent) loses N and gives the methylene group:

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Question ID VK-098353