Hydrocarbons - Result Question 77
####80. The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is
[2003]
(a) I $>$ II $>$ III
(b) III $>$ II $>$ I
(c) II $>$ III $>$ I
(d) I $<$ II $>$ III
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Solution:
- (a) Amino group is ring activating while nitro group is deactivating. Hence, correct order is aniline $>$ benzene $>$ nitrobenzene.
I $>$ II $>$ III
I
II
III $-NO_2$ is an electron attracting group hence decrease the electron density on ring, whereas $NH_2$ group is electron releasing group hence increase electron density on ring. Benzene is also $e^{-}$rich due to delocalization of electrons.
