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(A) Among the given compounds,the reactivity towards nucleophilic attack depends on the electrophilicity of the carbonyl carbon.$MeCOCl$ (acid chlorid

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$MeCOCl$

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(A) Among the given compounds,the reactivity towards nucleophilic attack depends on the electrophilicity of the carbonyl carbon.$MeCOCl$ (acid chloride) is the most reactive because the $Cl$ atom exerts a strong $-I$ effect and a weak $+R$ effect,making the carbonyl carbon highly electron-deficient.The general order of reactivity towards nucleophilic acyl substitution is: $MeCOCl > MeCOOCOMe > MeCOOMe > MeCHO$.Therefore,$MeCOCl$ is 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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