How does the use of Lewis acid catalysts create different products in Friedel Crafts alkylation versus acylation?

• A. In alkylation, the catalyst forms alkyl radicals, while in acylation, it forms acylium ions, leading to different functional groups on benzene.
• B. In both reactions, the catalyst serves as a solvent, determining the product's reactivity.
• C. In alkylation, the catalyst determines the reaction rate, while in acylation, it influences product stability.
• D. In alkylation, the catalyst stabilizes carbocations, while in acylation, it aids in forming acylium ions, resulting in different substituents on benzene.

Answer: (D)