Although trimethyl amine and n-propylamine have the same molecular mass, the former boils at a lower temperature (276 K) than the latter (322 K). Why?

Explanation

n-Propylamine has two H-atoms on the N-atom and hence undergoes intermolecular H-bonding thereby raising its boiling point. Trimethylamine, `(CH_(3))_(3)N` being a `3^(@)` amine does not have a H-atom on the N-atom. As a result, it does not undergo H-bonding and hence its boiling point is low.