JEE Main Chemistry question

The increasing order of the rate of HCN addition to compounds A–D, where A = HCHO, B = CH₃COCH₃, C = PhCOCH₃, D = PhCOPh, is:

(A)A < B < C < D
(B)D < B < C < A
(C)D < C < B < ACorrect
(D)C < D < B < A

Answer: (C)

Solution

Reactivity toward nucleophilic addition decreases as steric bulk and aryl-conjugation stabilization of the carbonyl increase: formaldehyde (least hindered,

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Question ID VK-149828