Question

What type of intermolecular force of attraction is found in $ICl$?

Answer 1

The electrons in the molecule will be shared unevently because Chlorine has a electronegative of $3.0$ and iodine has an electronegative of $2.5$. The electronegative difference is $0.5(3.0-2.5=0.5)$.

This means that electrons will basically spend more time on the $Cl$ side of the molecule creating a partial negative charge. The electrons spend less time on the $I$ side of the molecule creating a partial positive charge.

The partial negative $CI$ side of one $ICI$ molecule will attract the partial positive $I$ side of a neighboring molecules. This attraction is called a dipole interaction.