Which of the following is nucleophilic addition reaction?

C H_{3} C O C l C H_{3} M g B r (1 e q .) - --------- \to C H_{3} C O C H_{3}

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C H_{3} C O C H_{3} I_{2} / O H^{-} / △ - ------ \to C H_{3} C O O^{-} + C H I_{3}

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P h C H O K C N / H^{\oplus} - ----- \to P h C H (O H) (C N)

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C H_{3} C \equiv C M g B r C H_{3} B r - --- \to C H_{3} C \equiv C C H_{3}

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Solution

The correct options are
B $P h C H O K C N / H^{\oplus} - ----- \to P h C H (O H) (C N)$
D $C H_{3} C O C l C H_{3} M g B r (1 e q .) - --------- \to C H_{3} C O C H_{3}$
$K C N$ adds to the carbonyl group of benzaldehyde.

Cyanide ion acts as nucleophile. This is followed by acid hydrolysis to form cyanohydrin.

Hence, the reaction $P h C H O K C N / H^{\oplus} - ----- \to P h C H (O H) (C N)$ is a nucleophilic addition reaction.

In option A the Grignard reagent which acts as nucleophile and adds across $- C = O$ bond hence it is also nucleophillic addition.

Options A and C are correct.

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