GENERAL KNOWLEDGE

Detailed explanation-1: -So we can say that as the mass increases, the number of electrons increases, and melting and boiling points also increase. Long-chain molecules exhibit strong London dispersion forces because more displacement can be possible in such molecules.

Detailed explanation-2: -London dispersion are the weakest of the intermolecular forces which all molecules have, however the larger the surface area the molecule has the more London dispersion force it has. Dipole-dipole is stronger and exists in polar molecules.

Detailed explanation-3: -It is not that the mass of the molecules matters, it is simply that more mass implies more protons which implies more electrons. More electrons generally lead to more dispersion forces. Higher mass can also be farther down the periodic table. This will also be more polarizable.