When a nucleophile attacks a carbonyl compound, the one which is most reactive towards the nucleophile is:

C H_{3} C O C O C_{2} H_{5}

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C H_{3} C O C H_{2} C l

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4-Methoxybenzaldehyde

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C H_{3} C O C H_{2} C H_{2} C l

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Solution

The correct option is A $C H_{3} C O C O C_{2} H_{5}$
As the nucleophilic attack on carbonyl carbon atom depends on the electrophilicity of the carbon atom. In (a), a strong withdrawing $- C O$ group is attached to carbonyl carbon atom so the elctrophilicity of the carbon atom is considerably increased.

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