Alkyl side-chains can be oxidized to benzoic acid (or even a benzoic acid derivative if there are actually other teams present around the ring) by potassium permanganate (KMnO4) as long since the benzylic carbon has at the least just one hydrogen hooked up. This reaction leads to the formation of https://eduardoeysja.blogkoo.com/solution-bromure-de-potassium-secrets-56947580