Question

london dispersion forces are present in all molecules, but they are dominant in ______ molecules.

Explanation:

London dispersion forces are the weakest intermolecular forces, arising from temporary electron density fluctuations. In non - polar molecules, there are no dipole - dipole interactions or hydrogen bonding (in most cases). So, London dispersion forces become the dominant intermolecular force as there are no stronger intermolecular forces to overshadow them. For example, molecules like $O_2$, $N_2$, and hydrocarbons (with only C - H bonds, which are relatively non - polar) rely mainly on London dispersion forces.

Answer:

non - polar