Q. Consider the following substances

Propan-2-ol

Prpanone

2-methyl propene

The correct sequence of increasing order of boiling point is

 2041  176 NTA AbhyasNTA Abhyas 2020Chemical Bonding and Molecular Structure Report Error

Solution:

The high b.p. of the alcohol is due to intermolecular H-bonding. Carbonyl compounds and alkene have no H's for H-bonding. The dipole-dipole forces of carbonyl compounds cause them to have higher boiling points than alkene.

Hence, the correct sequence of increasing order of boiling point is 1 > 2 > 3.