Which of the following interactions is also known as London forces?
Dipole-dipole interactions
Ion- dipole interactions
Dipole – Induced Dipole Interactions.
Instantaneous Dipole – Induced Dipole Interactions.
This force is sometimes called an induced dipole-induced dipole attraction. 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.
Hence option number (4) is correct.