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(D) The susceptibility of a carbonyl group to nucleophilic attack depends on the electrophilicity of the carbonyl carbon. This electrophilicity is inc

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$CH_3COCl$

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(D) The susceptibility of a carbonyl group to nucleophilic attack depends on the electrophilicity of the carbonyl carbon. This electrophilicity is increased by the presence of an electron-withdrawing group attached to the carbonyl carbon. Among the given derivatives,the chloride ion $(Cl^-)$ is the weakest base and therefore the best leaving group. Since $Cl$ is highly electronegative and a good leaving group,it exerts a strong inductive effect,making the carbonyl carbon in $CH_3COCl$ the most electron-deficient and thus the most susceptible to nucleophilic attack.

Among the given compounds,the most susceptible to nucleophilic attack at the carbonyl group is

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