Question

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why do nonpolar molecules have a lower boiling point? and the opposite for polar molecules?

Answer 1

Answer:

The existence of dipole forces explains why polar molecules have higher boiling points and melting points than do nonpolar molecules. ... The polar substance always has the higher boiling point, indicating greater attractive forces between separate molecules, that is, larger intermolecular forces.

Answer 2

Answer:

Substances with hydrogen bonding, an intermolecular force, will have much higher melting and boiling points than those that have ordinary dipole-dipole intramolecular forces. Non-polar molecules have the lowest melting and boiling points, because they are held together by the weak van der Waals forces.