I haven't had a flight review in over ten years but I fly almost every day. Before you get on the phone to the local FSDO to report me for a violation of the regulations remember there are many activities that can substitute for a flight review. I was reminded of this when my friend Rick Felty told me that he did well on his recent BFR.
From strongest to weakest, the intermolecular forces rank in the following way: Strongest: Hydrogen bonding. This occurs when compounds contain O-H, N-H, or F-H bonds. Though referred to as hydrogen bonding, it's not a real bond but just a really strong intermolecular force. Less strong: Dipole-dipole forces. This takes place when polar compounds are attracted to one another. Weakest: London Dispersion Forces.
The intermolecular forces of attraction considered here are: Van der Waals' forces; permanent dipole-permanent dipole interactions; hydrogen bonding; Van der Waals' forces. Van der Waals' forces are forces of attraction which exist between all atoms and molecules. Van der Waals' forces are much weaker than all other types of bonding. They are only significant in atoms and molecules which have no other types of intermolecular forces of attraction, for example, discrete non-polar molecules and the Group 0 elements.