In the liquid state, hydrogen bonding is the strongest attractive force between molecules of similar size and mass.
Among two molecules in the liquid state with nearly the same size and mass, the strongest attractive force would be hydrogen bonding. Hydrogen bonds are a special type of dipole-dipole attraction that forms between a hydrogen atom bonded to one of the most electronegative elements (such as F, O, or N) and another molecule with a partially negative atom.
Dipole-dipole interactions and London dispersion forces are other types of attractive forces, but hydrogen bonding is typically stronger, especially in molecules with heavy atoms.
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