Which compound has the highest boiling point?

Question

Quizplus · Accepted Answer

Compound A (I) has the highest boiling point due to the presence of extensive hydrogen bonding between its molecules. Compound B (II) has London dispersion forces and dipole-dipole interactions, but the effect is weaker than hydrogen bonding. Compound C (III) has only London dispersion forces, which are weaker than both hydrogen bonding and dipole-dipole interactions. Compound D (IV) has only van der Waals forces, which are the weakest intermolecular forces, resulting in the lowest boiling point.

Which Compound Has the Highest Boiling Point