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$$\text{C}_6\text{H}_6 + \text{R--X} \xrightarrow{\text{Anhy. AlCl}_3} \text{C}_6\text{H}_5\text{--R} + \text{HX}$$
Electrophile: Carbocation ($$\text{R}^+$$); subject to carbocation rearrangements (1,2-hydride or 1,2-methyl shifts) yielding rearranged alkylbenzenes.
