Question

which compound has the highest boiling point? C2H6, CS2, CH4, CO2?

Answer 1

The order of strengths of intermolecular forces is: ion-ion > H-bonding > dipole-dipole > London dispersion.

Componds with stronger intermolecular forces have higher boiling points.

But all the above compounds i.e. C₂H6, CS₂, CH₄, CO₂ has london dispersion force as intramolecular force.

Hence other characteristics should be use.

Therefor "the compound having higher molar mass has higher boinling point".

The order of molar mass is CS₂>CO₂>C₂H₆>CH₄

Hence this is also the order of boiling point.

CS₂  has highest boiling point .