There is a way to cleave of a methyl group from a ketone through the haloform reaction,
Et-CO-Me ---> EtCOOH + HCX3
but there 's no way to chop off the beta methyl and replace it by a benzene.
realize this is probably a stupid question... but i need to learn somewhere.
I wish you good luck exploring the field of organic chemistry. You'll see it is a fascinating world. A good way to start learning is to buy an (elementary) organic chemistry is to buy a textbook, like:
Solomons, Organic chemistry