The strongest type of intermolecular force present in CHF3 is a dipole-dipole interaction.
CHF3 is a polar molecule and has a dipole-dipole interaction along with the weak dispersion forces.
Fluorine is highly electronegative, therefore, it will attract the electrons to itself, leaving the hydrogen end of the molecule positive.
This allows for other CHF3 molecules to be attracted to the positive side of the molecule, by allowing the negatively-charged fluorine side get attracted to the hydrogen side of the molecule.
