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) $P h C O P h$

A < B < C < D

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D < B < C < A

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D < C < B < A

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C < D < B < A

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Solution

The correct option is C $D < C < B < A$
Due to steric hindrance

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