An amine is an organic compound derived from ammonia (NH3) by replacing one or more hydrogen atoms with alkyl or aryl groups. This substitution gives amines a nitrogen atom bonded to carbon atoms and possibly hydrogens, with the nitrogen retaining a lone pair of electrons. Amines are classified based on how many hydrogens in the ammonia molecule are replaced: primary amines have one hydrogen replaced, secondary amines have two replaced, and tertiary amines have all three hydrogens replaced by organic groups. Amines are important functional groups in organic chemistry and have basic properties due to the lone pair on nitrogen. They can react to form ammonium salts and amides, among other reactions