Answer :
The Lewis acid and the chlorine atom of the acid chloride form a complex during the Friedel-Crafts acylation reaction. Cleaving the complex's C-Cl bond produces an acylium ion. The acylium ion is resonance stabilized and has a positive charge on the carbon atom.
The term "Friedel-Crafts Alkylation" describes the substitution of an alkyl group for an aromatic proton. This is accomplished by using a carbocation to conduct an electrophilic attack on the aromatic ring. Alkyl halides are used as reactants in the Friedel-Crafts alkylation reaction, which produces alkylbenzenes.
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