Which of the following is the most reactive?

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(D) The order of reactivity of acid derivatives towards nucleophilic acyl substitution reactions is: $RCOCl > (RCO)_2O > RCOOR' > RCONH_2$. This order

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Acetyl chloride

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(D) The order of reactivity of acid derivatives towards nucleophilic acyl substitution reactions is: $RCOCl > (RCO)_2O > RCOOR' > RCONH_2$. This order is determined by the leaving group ability; the reactivity decreases as the basicity of the leaving group increases. The leaving groups are $Cl^-$,$RCOO^-$,$RO^-$,and $NH_2^-$. Since $Cl^-$ is the weakest base,it is the best leaving group,making $Acetyl \ chloride$ $(RCOCl)$ the most reactive.

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