Which inter molecular force would effect the melting point at the most?

The intermolecular force that most significantly affects the melting point is hydrogen bonding. This strong type of dipole-dipole interaction occurs between molecules that have hydrogen atoms bonded to highly electronegative atoms like nitrogen, oxygen, or fluorine. The presence of hydrogen bonds requires more energy to break during the melting process, leading to higher melting points compared to substances that primarily experience weaker forces, such as van der Waals (London dispersion) forces or dipole-dipole interactions.