Final answer:
The intermolecular force present in a pure sample of CH4 is London Dispersion Forces (LDP). London dispersion forces occur in all molecules, including nonpolar molecules like CH4. They are caused by the motion of electrons and result in weak, temporary attractions between molecules.
Correct option is d.
Step-by-step explanation:
The intermolecular force present in a pure sample of CH4 is London Dispersion Forces (LDP).
London dispersion forces, also known as van der Waals forces, are the weakest intermolecular forces. They occur in all molecules, including nonpolar molecules like CH4. London dispersion forces are caused by the motion of electrons, which can induce a temporary dipole in an adjacent atom or molecule. In CH4, the movement of the electrons creates temporary dipoles, leading to weak, temporary attractions between molecules.