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

1. London force
2. hydrogen bond
3. ion - ion interaction
4. ion - dipole interaction

Correct answer: hydrogen bond

Solution

Ion-ion energy varies as 1/r, ion-dipole as 1/r^2, London dispersion as 1/r^6, while dipole-dipole (and hydrogen bonding, which is a strong dipole-dipole interaction) varies as 1/r^3. So the interaction with inverse-cube distance dependence is the hydrogen bond.

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