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Electrophilic substitution in case of ar...

Electrophilic substitution in case of aromatic amines takes place more readily than benzene. Why?

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Amino group is a ( + R) effect group, i.e., it gives electrons to the benzene ring. It increase the electrons density of the benzene ring. That is why electrophile attack more readily in aromatic amines than benzene.
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Knowledge Check

  • Amino group is ortho ,para directing for aromatic electrophillic substitution on nitration of anilline good amount of m nitroaniline is obtained this is due to

    A
    in nitration mixture `-NH_3^+`which is m-directing
    B
    `-NH_2` becomes `-NH^+SO_4^-` which is m directing
    C
    `-NH_2` becomes `-NH^+SO_4^-` which is m directing
    D
    `-NH_2` becomes`-NH NO_2^+` which is m directing

  • The correct order of reactivity towards electrophilic substitution of the compounds : aniline (I), benzene (II) and nitro benzene (III) is :

    A
    `III gt II gt I`
    B
    `II gt III gt I`
    C
    `I lt II lt III`
    D
    `I gt II gt III`

  • In electrophilic aromatic substitution reaction, the nitro group is meta directing because it

    A
    decreases electron density at ortho and para positions
    B
    decreases electron density at meta position
    C
    increases electron density at meta position
    D
    increases electron density at ortho and para positions

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    Each of the six compounds shown at the bottom of the page has two aromatic (benzene) rings. In each case the two rings are different and are labeled A & B. If an electrophilic substitution, such as nitration or bromination, is carried out on each compound, then identify which ring (A or B) will be preferentially attacked, and indicate the orientation of the substitution (ortho/para, meta or all sites).

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    above reaction is an example of Nucleophilic aromatic substitution. Which of the following halide (-X) is most readily replaced.

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