Question

The increasing order of the rate of HCN addition to compounds A-D is 

(A) HCHO

(B) CH₃COCH₃ 

(C) PhCOCH₃ 

(D) PhCOPh

(a) A < B < C < D

(b) D < B < C < A

(c) D < C < B < A

(d) C < D < B < A

Answer 1

Correct Option (c) D < C < B < A (C) PhCOCH₃ 

Explanation:

Addition of HCN is a nucleophilic reaction. Greater the electron deficiency of C atom of carbonyl group, higher the rate of reaction.