The order of decreasing stability of the cations is :   (I) `CH_(3)overset(+)CHCH_(3)` ,

The order of decreasing stability of the cations is : (I) `CH_(3)overset(+)CHCH_(3)` ,

The order of decreasing stability of the cations is : (I) `CH_(3)overset(+)CHCH_(3)` , (II) `CH_(2)overset(+)CHOCH_(3)` , (III) `CH_(3)overset(+)CHCOCH_(3)`