Question

Choose the incorrect statement in the following?

• A. Friedel-Crafts reaction between benzene and acetic anhydride in the presence of anhydrous $AlC{l}_3$ yields acetophenone and not poly substituted products.
• B. Acetophenone formed poisons the catalyst preventing further the Friedel-Crafts reaction.
• C. During fridel crafts alkylation reaction rearrangement of carbocation takes place.
• D. Carbocation is poor electrophile than acylium ion.

Answer 1

Answer: (B)

Friedel crafts Reaction between benzene and acetic anhydride in the presence of anhydrous $AlC{l}_3$ yields acetophenone. Polyacylation in Friedel craft reaction is not possible because acyl group is a deactivating group and only mono substitute product is formed therefore, during Friedel crafts alkylation carbocation formed so rearrangement of carbocation is possible, and it is weak electrophile then acylinium ion.