On what factors does the magnitude of London dispersion forces depend?

Which substance has the strongest London dispersion forces?

What is the dependence of interaction energy on the distance $(r)$ between molecules for the following forces?
$(i)$ London forces
$(ii)$ Dipole-dipole forces (stationary)
$(iii)$ Dipole-induced dipole forces

Covalent molecules are usually held in a crystal structure by

Which of the following substances does not conduct electricity?

The boiling points of noble gases are illustrative of the operation of forces of the type: