Question

Aniline does not go under friedel craft reaction by

Answer 1

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Aniline do not undergo friedel crafts reactions because AlCl3 which is used as a Lewis acid and a catalyst infriedel crafts reactions being electron deficient acts as Lewis base and attacks on the lone pair of nitrogen present in aniline to form an insoluble complex which precipitates out.

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Answer 2

the friedel-crafts reaction is carried out in the presence of lewis acid such as agcl3. aniline being basic  in nature react with agcl3 and form salt . due to the positive charge on nitrogen electrophillic subsitution reaction on benzene ring deactivated. hence aniline does not under go friedel craft reaction.