Oxidation of ketones is carried by strong oxidizing agent like concentrated HNO3, KmNO4/H2SO4, dil K2Cr 2O7/H2SO4
For eg
CH3COCH2CH3 +Conc. HNO3= CH3COOH + CH3COOH
CH3COCH2CH2CH3 + conc.HNO3 = CH3COOH + CH3CH2COOH.
Breaking of C ---CO bond takes place according to —poppof's rule
Which states that carbonyl group stays together with smaller alkyl group.