Answer :
1)
dispersion forces. These are electron-rich compounds, and the
electrons are relatively far away from the nucleus and each other. The
electrons on one molecule see the positive core (Effective Nuclear
Charge) of the next molecule, and draw the first molecule closer. This
pretty much describes dispersion forces.
Answer is: dispersion forces.
The London dispersion force is the weakest intermolecular force.
Dispersion force is also called an induced dipole-induced dipole attraction.
The London dispersion force (intermolecular force) is a temporary attractive force between molecules.
The dipole beetween iodine and bromine is weak.