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Chemistry Question on reaction mechanism

The increasing order of the rate of HCN addition to compounds A-D is : (A) HCHOHCHO (B) CH3COCH3CH_3COCH_3 (C) PhCOCH3PhCOCH_3 (D) PhCOPhPhCOPh

A

A<B<C<DA < B < C < D

B

D<B<C<AD < B < C < A

C

D<C<B<AD < C < B < A

D

C<D<B<AC < D < B < A

Answer

D<C<B<AD < C < B < A

Explanation

Solution

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