Which functional group contains a nitrogen atom bound to one or more carbons?

The functional group that contains a nitrogen atom bound to one or more carbon atoms is an amine. Amines are characterized by the presence of a nitrogen atom, which can be attached to one or more alkyl or aryl groups (carbon-containing groups). This structure gives amines their unique properties and reactivity in organic chemistry.

In contrast, the other options represent different functional groups that do not contain nitrogen. Alcohols contain hydroxyl (-OH) groups attached to carbon atoms, esters have a carbonyl group (C=O) linked to an alkoxy group (derived from an alcohol), and ketones are defined by a carbonyl group situated between two carbon atoms. Thus, the presence of a nitrogen atom specifically distinguishes amines from these other functional groups.