Question

why do primary amines have higher boiling point than tertiary amines

Answer 1

actully in the tertiary amine ther is no hydrogen atoms attached  to the nitrogen.  thats why the hydrogen bonding between tertiary amine molecules is impossible. so becoz of thatthe boiling point is much lower in case of tertiary amine.

but in case of primary amine there are 2 hydrogen is attached to the nitrogen so hydrogen bonding is possible in case of primary amine and have much more higher boiling point.
 

Answer 2

Hey !!

In tertiary amines there are no H--atoms whereas, in primary amines, two H---atoms are present. Due to presence of H----atoms, primary amines undergo extensive intermolecular H----bonding.

As a result, extra energy is required to separate the molecules of primary amine. Therefore, primary amines have higher boiling point than tertiary amine.

GOOD LUCK !!