Chapter 15, Problem 15.11QP

Interpretation Introduction

Interpretation:

The boiling point of amines, alkanes, and alcohols with the same molecular mass has to be compared.

Explanation of Solution

Amines contains nitrogen atom as well hydrogen atoms, among them nitrogen is more electronegative.  So, the polar $N-H$ bond and hydrogen bonds occur between primary amine and secondary amines and due to this, amines have higher boiling point than alkanes, which are non-polar.  Comparatively $O-H$ bond is more polar in nature to $N-H$ bond and alcohols exhibits intermolecular hydrogen bonding and which is stronger than the intermolecular hydrogen bonding between primary amine and secondary amine.  Hence, alcohols has higher boiling point than amines and alkanes.  The increasing trend of boiling point among alkanes, amines and alcohols is,

    $\text{alkanes }\text{< amines }\text{< alcohols}$