Ethanol is a liquid at room temperature while ethane is a gas. Which difference best explains this?

1. Whether a substance is a gas or a liquid at room temperature depends on the forces between its molecules. 2. Weak forces between molecules give a low boiling point, because little energy is needed to pull the molecules apart. 3. Strong forces between molecules give a high boiling point. 4. Ethane is a hydrocarbon with no polar group, so the only forces between its molecules are weak induced dipole forces. 5. Ethanol carries a hydroxyl group, in which hydrogen is bonded to a small highly electronegative oxygen atom. 6. That lets ethanol molecules hold each other with hydrogen bonds, which are far stronger than induced dipole forces. 7. The stronger forces raise the boiling point of ethanol above room temperature, so it stays liquid while ethane is a gas. 8. The mass difference is small and both molecules have two carbon atoms, so neither of those options can be the reason, and ethane has no hydrogen bonding at all. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 4: Organic molecules_