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Why does acetylation of - NH2 group of a...

Why does acetylation of - `NH_2` group of aniline reduce its activity effect?

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Due to electron withdrawing effect of the acetyl group, the lone pair of electrons 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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