High density polythene

Low density polythene

Melamine

PVC

Dipole - dipole interaction

Dipole - induced dipole interaction

London dispersion force

Hydrogen bonding

Valeric acid

Caproic acid

Glutaric acid

Butyric acid

$1.17 \times 10^{-8} \mathrm{~cm}$

$3.40 \times 10^{-8} \mathrm{~cm}$

$5.12 \times 10^{-8} \mathrm{~cm}$

$6.81 \times 10^{-8} \mathrm{~cm}$