The dipole-dipole interaction energy between polar molecules in the solid state will be proportional to ....…
The dipole-dipole interaction energy between polar molecules in the solid state will be proportional to ...... [if $r$ denotes the distance between polar molecules]
$\frac{1}{r^6}$
$\frac{1}{r^3}$
$\frac{1}{r^2}$
$\frac{1}{r}$
Solution
Dipole-dipole interaction energy between polar molecules in solids depends on the distance between them as per following relation.
Dipole-dipole interaction energy $\propto \frac{1}{r^3}$
( $r=$ radius on the molecule under consideration) Hence, the correct option is (2).