Suggest a reagent for the following conversion.

Explanation

The given reactant is `H_(3)C-CH=CH-overset(OH)overset(|)(CH)-CH_(3)`. It is a secondary alcohol. Secondary alcohol gives ketone when oxidises by `CrO_(3)` or pyridinium chlorochromate without carrying out oxidation at the double bond.
`H_(3)C-CH=CH-overset(OH)overset(|)(CH)-CH_(3) underset(CrO_(3))overset(PC C)rarrH_(3)C-CH=CH-overset(O)overset(||)(C)-CH_(3)`