posted by shay .
is IBr a hydrogen bonding or dipole-dipole interactions or dispersion forces
It isn't H bonding; there are no H atoms and neither atom is N, O, F. I wouldn't think it's much of a dipole; Br is 2.96 and I 2.66 and that is only a small difference (but perhaps some dipole character). Both I and Br are large molecules with lots of electrons so I would go with dispersion forces predominantly.
thanks a lot DrBob222 you're such a big help