Question

Intermolecular Forces Question: Match each of these substances with the property it exhibits.

The Substances:
NH3
CH3CH2CH=CH2
CH3(CH2)5CH3
He

The properties:
largest dispersion forces
largest dipole dipole forces
none of the properties listed
the lowest boiling point

Answer 1

I figured it out myself!

NH3 has the largest dipole-dipole forces

CH3CH2CH=CH2 has none of the properties listed

CH3(CH2)5CH3 has the largest dispersion forces

He has the lowest boiling point

This is because generally dipole-dipole forces and hydrogen bond interactions are stronger that dispersion forces. And dispersion forces increase with increasing molar mass, however, so the strengths of these intermolecular interactions overlap significantly as the molar mass increases.