Arrange the following in decreasing order of their reactivity towards nucleophilic addition reaction.
CH3COCH3, CH3CH2CHO, HCHO, (CH3)2CHCHO
An alkyl halide with molecular formula C6H13Br on dehydro halogenation gave two isomeric alkenes X and Y with molecular formula C6H12. On reductive Ozonolysis, X and Y gave four compounds CH3COCH3,CH3CHO,CH3CH2CHO and (CH3)2 CHCHO. The alkyl halide is