# What is the strongest intermolecular force of attraction?

Quite probably $\text{hydrogen bonding...}$
We speak of $\text{intermolecular forces of attraction}$, and so immediately we can dismiss ALL non-molecular substances, i.e. ionic solids, network covalent solids, metals etc. And now let us consider the humble water molecule, and ammonia, and hydrogen fluoride...and compare its volatility with the heavier hydrides of Group 15, 16, and 17.
And so I maintain that the strongest intermolecular force of attraction is $\text{intermolecular hydrogen bonding}$. The volatility of water, a mere $18 \cdot g \cdot m o {l}^{-} 1$ with respect to mass, but which is a whopping normal boiling points of $100$ ""^@C, is clear and persuasive evidence of this proposition.