Correct Answer: A
Explanation:
Electrophilic substitution happens in many of the reactions of compounds containing benzene rings the arenes. It can maintain the delocalisation if it replaces a hydrogen atom by an electrophile in substitution reaction. Acylation means substituting an acyl group into a benzene ring in place of hydrogen atom to give acetophenone is an example of friedel craft acylation.
Catalyst: AlCl3 or any lewis acid