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a
b
c
d
All the three
answer is D.
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Detailed Solution
Vinyl and aryl halides can't be used as the halide component because they do not form carbocations readily; -NH2, -NHR and -NR2 groups react with Lewis acids used in Friedel- Crafts reaction to form electron-withdrawing groups, which deactivate the benzene nucleus for electrophilic substitution.On the same reason, presence of electron-withdrawing group like −NO2,−NH3, −CF, −COOH, −COR, −SO3H, etc.,make the benzene ring less prone to Friedel-Crafts reaction.