Which liquid has stronger intermolecular forces?

Water (H-O-H) has stronger intermolecular forces than methanol (CH₃-O-H).

The intermolecular forces in both water and methanol are mainly hydrogen bonds. Water has stronger hydrogen bonds between their molecules because :

Firstly, each water molecule has 2 H atoms that can form hydrogen bonds, while each methanol molecule has only 1. Water has a greater number of hydrogen bonds.

Secondly, the -CH₃ groups can somehow break hydrogen bonds between molecules when the molecules move.

Both water and methanol have also van der Waals’ forces between their molecules. The van der Waals’ forces between water molecules are weaker than those between methanol molecules because the size of water molecule is smaller. Overall speaking, water has stronger intermolecular forces because the contribution of van der Waals’ forces is much smaller than hydrogen bonds in these two compounds.

Water. Lower molecular weight, higher boiling point.