Which type of amines are derived from ammonia (NH₃) by replacing one hydrogen atom with alkyl?

Primary amines have one hydrogen atom in ammonia replaced by an alkyl group. The nitrogen still has two hydrogen atoms attached plus the alkyl group.

The structure is R-NH₂, where R represents the alkyl group. Common examples include methylamine (CH₃NH₂) and ethylamine (C₂H₅NH₂).

Secondary amines have two alkyl groups, tertiary have three, and quaternary have four. The number of alkyl groups determines the classification of the amine.