Question

What is the predominant intermolecular force between ibr molecules in liquid ibr?

Answer 1

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 2

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.