The low polarity of all the bonds in alkanes means that the only intermolecular forces between molecules of alkanes are the very weak induced dipole - induced dipole forces. These forces are easily overcome.
There are three different types of intermolecular forces, dipole interaction, hydrogen bonding, and dispersion forces. The only one that occurs with Benzene is dispersion forces because it is a non-polar molecule. The other two forces only obtain to polar molecules.