Instantaneous dipole is produced when _.

Explanation

Option A) Two polar molecules come closer is incorrect because polar molecules already have a permanent dipole moment due to the unequal distribution of electrons in the molecule. The interaction between polar molecules is due to dipole-dipole interactions, not instantaneous dipole-induced dipole interactions.Option B: Because of the constant motion of the electrons, an atom or molecule can develop a temporary (instantaneous) dipole when its electrons are distributed unsymmetrically about the nucleus. Dispersion forces are present between any two neutral molecules when they are almost touching. In the case where polar molecules are involved, INDUCED dipoles are produced where the polar molecule(s) induces a charge in the other molecule.Option C: Polar and nonpolar molecules coming closer is also incorrect because polar and nonpolar molecules have different electronic distributions and polarities, resulting in different types of intermolecular forces.Option D: As explained above this option is incorrect.