IF5, iodine pentafluoride, is a polar molecule due to the lone pair of electrons on the central iodine atom and the highly electronegative fluorine atoms. This polarity leads to the presence of dipole-dipole interactions between IF5 molecules.

While London dispersion forces are present in all molecules, they are relatively weak compared to dipole-dipole forces in IF5 due to the significant dipole moment.

Therefore, the main intermolecular forces present in IF5 are dipole-dipole interactions.