Question

What is the difference between Keesom interactions and, London dispersion forces?

Answer 1

Keesom interactions are dipole-dipole interactions, while London dispersion forces are induced dipole-induced dipole interactions.

Explanation:

Both types of interaction contribute to van der Waals forces.

Keesom interactions

Keesom interactions are the electrostatic interactions among the permanent dipoles of polar molecules.

They arise when the `δ^"+"` end of a dipole in one molecule is attracted to the `δ^"-"` end of a dipole in another molecule.

London dispersion interactions

London dispersion interactions arise when a temporary imbalance of electrons of a nonpolar molecule induce a temporary dipole in another nearby molecule.

You can find more details about the differences in this Socratic answer.