Tertiary amines have the lowest boiling points because ,

Step-by-step solution

Tertiary amines have the general formula R₃N . Since there are no hydrogen atoms directly attached to the highly electronegative nitrogen atom, they cannot form intermolecular hydrogen bonds. In contrast, primary and secondary amines have hydrogen atoms attached to nitrogen and can form intermolecular hydrogen bonds, which leads to higher boiling points. Due to the absence of intermolecular hydrogen bonding, tertiary amines have the lowest boiling points among isomeric amines.