I remembering reading that the interaction between a polar molecule and non-polar molecule is stronger than the interaction between two non-polar molecules.
However, in analytical chemistry classes, we are told that polar molecules elute first in a Gas Chromatograph that has a non-polar column. According to http://www.chem.ucla.edu/~bacher/General/30BL/gc/theory.html
If the polarity of the stationary phase and compound are similar, the retention time increases because the compound interacts stronger with the stationary phase. As a result, polar compounds have long retention times on polar stationary phases and shorter retention times on non-polar columns using the same temperature.
These two concepts seem to conflict. Is there something else that is going on? Shouldn't polar compounds elute last even if the stationary phase is non-polar.
(Also sidenote: most mobile phases in Gas Chromatography are non-polar: helium, argon, or nitrogen)