Question

ethilebenzeneCH2CH3+KMnO4+KOH---?​

Answer 1

This reaction is normally typical when the an alkyl group is attached to the benzene ring and the product formed is normally benzoic acid and this reaction is an oxidation reaction.

When ethylbenzene reacts with KMnO4/ KOH in presence of H+ion the product for that reaction is benzoic acid.

H+  ions acts as catalyst in this reaction and the reaction normally takes place in basic medium  and that is the reason why KOH is used.