Friedel–Crafts alkylation involves the alkylation(addition of alkyl group) to an aromatic ring with an alkyl halide using a strong Lewis acid, such as aluminium chloride, ferric chloride as solvent.
C6H6+CH3Cl→C6H5CH3+HCl
Friedel–Crafts acylation involves the acylation of aromatic rings. Typical acylating agents are acyl chlorides. Typical Lewis acid catalysts are acids and aluminium trichloride.