If you are comparing two compounds with only primary amines, and one compound has more primary amines than the other, would the one with more have a higher boiling point? (True, if there are no groups that make H-bonds stronger than amino-groups (e.g. alcohols, carboxylic acids. - GS). If so, would this have to do not only with hydrogen bonds, but also van der waals forces? (Van der Waals forces are negligible compared with H-bonds,- GS).