There are substitutions for the flight review which will make you a more competent pilot, learn more, and in some cases it will cost you less than a regular fight review. Before we go into that lets review what a flight review is.
1 Hydrogen bonding is the strongest type of intermolecular force arising from permanent dipole permanent dipole attraction and the partially positive proton end of one molecule attracts the partially negative nitrogen (or oxygen/fluorine) lone pair end of a close neighbouring molecule.
Ethanol (CH 3 CH 2 OH) experiences the same types of intermolecular forces as 1,2-ethanediol but the hydrogen bonding can only occur at one site per molecule rather than two. This results in reduced interactions between molecules compared with 1,2-ethanediol but still more than in ethane and dimethyl ether which lack hydrogen bonding between their molecules.