Question

What r london forces and dipole-induced dipole interactions?

Answer 1

london force:Atoms and non polar molecules are electrically symmetrical and have no dipole moment but a dipole may momentarily may develops even in such Atoms and molecules.
Dipole induced dipole interaction:
This type of attraction forces operate polar molecules having permanent dipole and that molecules lacking permanent dipoles.Permanent dipole of the polar molecule induces dipole on neutral molecule by deforming it's electronic cloud