based on intermolecular forces, which of these substances would have the highest boiling point? He O2 Ch4 NH3?

NH₃ would have the highest boiling point.

Explanation:
NH₃ molecules are held together by intermolecular hydrogen bonds. On the other hand, the molecules of the other three substances are held together by van der Waals’ forces. For small molecules with similar sizes, intermolecular hydrogen bonds are stronger than van der Waals’ forces.

NH3 has hydrogen bonding.

NH3