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Q.

The increasing order of rate of HCN addition to following compounds is
A) HCHO 
B) CH3COCH3
C) PhCOCH3 
D) PhCOPh

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a

C < D < B < A

b

A < B < C < D

c

D < B < C < A

d

D < C < B < A

answer is C.

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Detailed Solution

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Addition of HCN is nucleophilic addition. Greater the electron deficiency of carbonyl group higher the rate of reaction.

Hence, D < C < B < A

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