Identify the major product from the following reaction sequence.

Step-by-step solution

Treatment of an alkylbenzene with potassium permanganate results in oxidation to give the benzoic acid. The reaction only works if there is a hydrogen attached to the carbon of alkyl group. As the carboxylic group is deactivating group, it directs Br ⁺ electrophile to meta-position. The Br ⁺ electrophile is formed through this reaction.