The increasing order of the rate of HCN addition to compounds A-D is: (A) HCHO

Question - The increasing order of the rate of HCN addition to compounds A-D is:
(A)

H C H O

(B)

C H_{3} C O C H_{3}

(C)

P h C O C H_{3}

(D)

P h C O P h

Options:

A . A

B . D

C . D

D . C

Answer: Option C
:
C
Due to steric hindrance

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