(CH3)2C=CHCOCH3 can be oxidized to (CH3)2C=CHCOOH by:

Chromic acid  NaOI Cu at 300ºC KMnO4

NaOI

Only NaOI (iodoform reaction)will oxidize COCH3 to COOH while all other reagents will bring about oxidation both at the double bond as well as the keto group.