GENERAL KNOWLEDGE

Detailed explanation-1: -Dispersion forces are present between all molecules, whether they are polar or nonpolar. Larger and heavier atoms and molecules exhibit stronger dispersion forces than smaller and lighter ones.

Detailed explanation-2: -There are three types of intermolecular forces: London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonding. Molecules can have any mix of these three kinds of intermolecular forces, but all substances at least have LDF.

Detailed explanation-3: -Dipole-dipole forces are the attractive forces that occur between polar molecules (see figure below).

Detailed explanation-4: -The only predominant intermolecular force present in noble gases is the London dispersion force.

Detailed explanation-5: -Evidently, all compounds have London dispersion forces between them. In some compounds, such as water, it may be the weakest force among other intermolecular forces, whereas in others, such as methane, it may be the only force between the particles.