Question

The intermolecular interaction that is dependent on the inverse cube of the distance between the molecules is:

• A. Ion-ion interaction
• B. Ion-dipole interaction
• C. London force
• D. Hydrogen bond

Answer 1

Ion-ion interactions are attractive forces between ions with opposite charges. They are also referred to as ionic bonds and are the forces that hold together ionic compounds.

Example:

Ion-Ion interactions $\propto \frac{1}{r}$

An ion-dipole interaction is the result of electrostatic interaction between a charged ion and a molecule that has a dipole.

Ion dipole interactions $\propto \frac{1}{r^2}$

London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.

London forces$\propto \frac{1}{r^6}$

A hydrogen bond is a primarily electrostatic force of attraction between a hydrogen atom which is covalently bound to a more electronegative atom or group, and another electronegative atom bearing a lone pair of electrons the hydrogen bond acceptor.

Hydrogen bonding(Dipole-Dipole interactions) $\propto \frac{1}{r^3}$

The correct option is D. Hydrogen bond.