Discuss the role of Lewis acids in halogenations and alkylation reactions of benzene. Write the limitations of Freidel Crafts alkylation reaction.

Lewis acids play a crucial role in the halogenation and alkylation reactions of benzene by acting as catalysts that generate more reactive electrophiles. In halogenation, when benzene reacts with halogens like chlorine or bromine, a Lewis acid such as FeCl₃ or AlCl₃ is used. The Lewis acid polarizes the halogen molecule, forming a halonium ion (Cl⁺ or Br⁺), which acts ___ ___ _____ _________ __________ ____ ______ __________.
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