JEE Main Chemistry question

Which of the following does not undergo benzoin condensation?

(A)Benzene carbaldehyde
(B)p-Toluene carbaldehyde
(C)PhenylethanalCorrect
(D)4-Methoxybenzaldehyde

Answer: (C)

Solution

Benzoin condensation (catalyzed by cyanide ion) specifically requires an aromatic aldehyde with no α-hydrogen (the carbonyl carbon's only other substituent is the aromatic ring itself). Phenylethanal (phenylacetaldehyde, PhCH₂CHO) is an aliphatic

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Question ID VK-149390