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.
Among other things, intermolecular forces are important to hydrophilic (water-loving) and hydrophobic (water-hating) interactions. All intermolecular forces are van der Waals forces; that is, they are not true bonds in the sense of sharing or transferring electrons, but are weaker attractive forces. These forces include dipole-dipole forces, hydrogen bonding, and ionic interactions. 1  Dipole-dipole forces exist between polar regions of different molecules. 2  Hydrogen bonding, as the name implies, involves hydrogen. 3  Ionic interactions may serve as intermolecular or intramolecular forces in biological systems.