Methods a, b, c, and e are formal additions of H2O or OH to the double bond, so no carbonyl compound. Method d splits molecule by the double bond and usually produces two carbonyl compounds (one in a few cases). So it\'s d) Solution Methods a, b, c, and e are formal additions of H2O or OH to the double bond, so no carbonyl compound. Method d splits molecule by the double bond and usually produces two carbonyl compounds (one in a few cases). So it\'s d).