GENERAL KNOWLEDGE

Detailed explanation-1: -HCl molecules, for example, have a dipole moment because the hydrogen atom has a slight positive charge and the chlorine atom has a slight negative charge. Because of the force of attraction between oppositely charged particles, there is a small dipole-dipole force of attraction between adjacent HCl molecules.

Detailed explanation-2: -HCl being a polar molecule will have dipole-dipole interaction. Though HCl is having London dispersion force, the dipole-dipole interaction is more.

Detailed explanation-3: -Dipole-induced dipole forces (because HCl is polar while He atom has symmetrical electron cloud)

Detailed explanation-4: -In aqueous solution there are strong dipole-dipole interactions between HCl and water molecules.

Detailed explanation-5: -Dipole–dipole forces occur between molecules with permanent dipoles (i.e., polar molecules). For molecules of similar size and mass, the strength of these forces increases with increasing polarity. Polar molecules can also induce dipoles in nonpolar molecules, resulting in dipole–induced dipole forces.