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  4. Assertion: Benzene reacts with iodine monochloride in presence of anhyd. AlCl3 to form iodobenzene. Reason: Iodine monochloride reacts with anhyd. AlCl3 to produce I+ which attacks the benzene ring.

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Q. Assertion : Benzene reacts with iodine monochloride in presence of anhyd. $AlCl_3$ to form iodobenzene.
Reason : Iodine monochloride reacts with anhyd. $AlCl_3$ to produce $I^+$ which attacks the benzene ring.

AIIMSAIIMS 2017Hydrocarbons

Solution:

Benzene reacts with iodine monochloride in presence of anhyd. $AlCl _{3}$ to form iodobenzene.
Iodine monochloride reacts with anhyd $AlCl _{3}$ to produce $I ^{+}$which acts as electrophile and attacks the benzene ring.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Note: Anhyd. $AlCl _{3}$ acts as lewis acid catalyst.
$AlCl _{3}+ ICl \rightarrow I ^{+}+ AlCl _{4}^{-}$
$C _{6} H _{6}+ I ^{+} \rightarrow C _{6} H _{5}- I + H ^{+}$