Draw the acylium ion generated when benzene reacts with β-propiolactone in the presence of aluminum chloride.

Write a Friedel-Crafts reaction for the synthesis of propiophenone (propionylbenzene) from benzene.

Using Friedel–Crafts acylation reaction, propose the synthesis of propylbenzene.

Propose the plausible synthesis that would form cyclopentyl(phenyl)methanone using Friedel–Crafts acylation, Clemmensen reduction, or Gatterman–Koch reaction.