The relative reactivities of acyl compounds towards of nucleophilic substitution are in the order of
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Acyl chloride> Acid anhydride> Ester> Amide
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Ester > Acyl chloride> Amide > Acid anhydride
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Acid anhydride > Amide > Ester> Acyl chloride
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Acyl chloride > Ester > Acid anhydride > Amide