Reaction of benzene with Me_3C""COCl in the presence of anhydrous AlCl_3 gives-
Answer»
SOLUTION :In this electrophilic substitution, removel of CO from the electrophile, acylium ion `(Me_(3)Coverset(oplus)(C) = O)` results in a more stable tertiary butyl carbocation `(Me_(3)overset(oplus)(C))`. THUS, `C_(6)H_(5)CMe_(3)` is formed as the product.