Question

A. rank compounds in order of increasing boiling point.
B. explain your rationale.
methanesulfonic acid (CH3SO3H)
ethanol (CH3CH2OH)
triethylamine ((CH3)3N)
Propylamine ((CH3CH2CH2)NH2)

Answer 1

Ranking of compounds in terms of boiling point

Increasing order of boiling point,

(lowest) propylamine < ethanol < triethylamine < methanesulfonic acid (highest)

The boiling point increases as the strength of intermolecular forces increase in the compound. So for methanesulfonic acid strong hydrogen bonds between the molecules raises it boiling point. The strength of intermolecular forces of attraction goes down from methansulfonic acid to propylamine and so it the boiling point also reduces in the same order.