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Friedel Crafts alkylation and acylation reactions involve a three-step mechanism:
Due to the presence of a Lewis acid, generation of electrophile takes place. As Lewis acid accepts the electron pair from the attacking reagent.
The electrophiles generated attacks on the benzene ring to form positively charged cyclohexadienyl cation better called arenium ion containing one sp3 hybridized carbon atom. The positive charge is effectively distributed over three carbon atoms due to resonance which makes it partially stable.
As delocalization of electrons stops at hybridized carbon atom, the arenium ion is not aromatic in nature.
The arenium ion finally loses its proton from sp3 hybridized carbon to a Lewis base restoring the aromaticity.
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