  carbonyl group does not have hydrogen, it is a carbon double bonded to oxygen. by adding a nucleophile such as H-or water you can form an alcohol in an addition reactio … n.2 people found this useful.Priyadarshi Raj. carbonyl group does not have hydrogen, it is a carbon double bonded to oxygen. by adding a nucleophile such as H-or water you can form an alcohol in an addition reactio … n. 2 people found this useful. Priyadarshi Raj.