Bases on intermolecular forces, which of these substances would have the highest boiling point?

Question

1 - He
2 - Osubscript2
3 - CHsubscript4
4 - NHsubscript3

Based* sorry about that

Answer 1

NH3 would have the highest boiling point because it has stronger inter-molecular forces.
He has only London dispersion forces
O2 has only London dispersion forces
CH4 Has only London dispersion forces
NH3 Has London dispersion and hydrogen bonding (due to its polar covalent bonds and the molecule being a dipole)

Answer 2

NH3, ammonia, would have the highest boiling point. In intermolecular forces, the H's would be attracted to the non bonding electrons on :NH3.

CH4 would have the second highest boiling point, because of the molecular weight, but no intermolecular forces. There would be van der Waal forces.

O2 third because of the above reasons. There would be van der Waal forces.

He lowest of all. And of all the gases listed above, only the ability of helium to liquefy is owing to Heitler-London forces.

Answer 3

I think NH3 has hydrogen bonding, so that would be the strongest.