Question

What determines the strength of the attraction between molecules?

Answer 1

rigidity ,if the substance easily not changing it's state by giving heat then it shows strong force of attraction

Answer 2

To determine strength of attractive forces between the molecules the size of the molecules, their polarity (dipole moment), and their shape. ... If two molecules have about the same size and similar shape, the dipole-dipole intermolecular attractive force increases with increasing polarity.