When I think about polarity, I divide up a molecule into a polar and a non polar portion. For the series CH3(CH2)nOH, where n = 0, 1, 2, as n becomes larger, the overall polarity becomes smaller. Water lacks any non polar portion. Methanol, ethanol, and propanol are miscible with water, but butanol is not, because the non polar portion is large, relative to the polar portion. I just looked up the strengths of these solvents in chromatography, and the Trent is for eluant strength to be inversely related to n.