# Which molecule has the strongest intermolecular force? A.F^2 B.CIF C.CF D.HF

The answer is clearly $D$........
${F}_{2}$ is a covalent molecule, and a gas at room temperature. $C l F$ is an interhalogen molecule, and also (I think) a gas. I don't know what $C F$ is; possibly $\text{californium}$, or they might have meant difluorocarbene, $: C {F}_{2}$.
Hydrogen fluoride, $H F$, has extensive INTERMOLECULAR hydrogen bonding, because the individual molecules comprise a molecular dipole, i.e. ""^(delta+)H-F^(delta-), and this intermolecular force is responsible for the elevated normal boiling point of $H F$ at $19.5$ ""^@C.