Given one method for the preparation of ketone from alcohol.

Explanation

Secondary alcohols are oxidised to ketones by chromic anhydride `(CrO_(3))`
`R-underset(OH)underset(|)(CH)-R^(1)-overset(CrO_(3))(to)R-underset(O)underset(||)(C)-R^(1)`
`CH_(3)-underset(OH)underset(|)(CH)-C_(2)H_(5)overset(CrO_(3))(to)CH_(3)-overset(O)overset(||)(C)-C_(2)H_(5)`