A—CH3              B—CH2CH3         C—CHCH32   D) -CCH33 E) -CH=CH2      F—COCH3

—CCH33 group does not contain benzylic hydrogen atoms;It cannot be oxidized to —COOH groupAlkyl groups of any chain length (or) branching can be oxidized completely to —COOH provided they contain a benzylic hydrogen atoms.—CH=CH2 group undergoes C = C cleavage and —COCH3 group undergoes C—C cleavage (Popoffs rule)