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Why does acylation of -NH(2) of aniline ...

Why does acylation of `-NH_(2)` of aniline reduces its activating effect?

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Due to electron withdrawing effect of the acetyl group, the lone pair of electron on N-atom is attracted by the `-overset(O)overset(||)C-` group. As a result, lone pair of electrons on N-atom is not exclusively available for donation to the benzene ring and hence activating effect of the `NH_(2)` group is reduced.
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