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

Give reasons : Acetylation of aniline reduces its activation effect.

Give reasons for the following (a) Acetylation of aniline reduces its activation effect. (b) CH_(3)NH_(2) is more basic than C_(6)H_(5)NH_(2) . (c) Although -NH_(2) is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

Assertion: Aniline does not undergo Friedel-Crafts reactions. Reason: -NH_2 group of aniline reacts with AlCl_3 to give acid-base reaction.

Knowledge Check

  • -NH_(2) group in aniline is

    A
    meta directing
    B
    ortho directing
    C
    para directing
    D
    `o-` and `p-` direction

  • -NH_(2) group in aniline is

    A
    only o-directing
    B
    only p-directing
    C
    only m-driecting
    D
    o and p directing

  • Assertion: Aniline does not undergo Friedel-Crafts reactions. Reason: -NH_2 group of aniline reacts with AlCl_3 to give acid-base reaction.

    A
    A and R are true and R is the correct explanation of A
    B
    A and R are true and R is not the correct explanation of A
    C
    A is true R is false
    D
    A is false R is true