Rotation about the CH₂CH₂ bond of the molecule of 1 propylamine, CH₃CH₂CH₂NH₂, produces four limiting conformers. One of these is particularly stable. The remaining three limiting conformers may be estimated to contain 0.7, 3.0, and 5.0 kcal/mol more energy than the most stable conformer.
Define two reference atoms in the molecule of 1 propylamine.