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(D) In nucleophilic acyl substitution reactions,the rate of reaction depends on the ability of the group $Z$ to act as a leaving group.The better the

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$Cl$

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(D) In nucleophilic acyl substitution reactions,the rate of reaction depends on the ability of the group $Z$ to act as a leaving group.The better the leaving group,the faster the reaction.$A$ good leaving group is the conjugate base of a strong acid,which means it is a weak base.Comparing the basicity of the leaving groups:$Cl^-$ is the conjugate base of $HCl$ (a strong acid).$OCOCH_3^-$ is the conjugate base of $CH_3COOH$ (a weak acid).$OC_2H_5^-$ is the conjugate base of $C_2H_5OH$ (a very weak acid).$NH_2^-$ is the conjugate base of $NH_3$ (an extremely weak acid).Since $Cl^-$ is the weakest base among the given options,it is the best leaving group,making the reaction fastest when $Z = Cl$.

The rate of reaction is fastest when $Z$ is.....

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