Answer in Organic Chemistry for Fadi Geogre #120492
Alcohols are able to form hydrogen bonds, which explains their relatively high boiling and freezing temperatures: 97 oC and -126 oC for propanol, and 82 oC and -89 oC for isopropanol. Propanal and isopropanal are not capable of forming hydrogen bonds, so they are more volatile, boiling and freezing poins is 49 oC and -81 oC for propanal and 57 oC and -95 oC for isopropanal. The ability to form hydrogen bonds also explains the very high solubility of propanol and isopropanol in water – they are indefinitely miscible with it. Acetone also(isopropanal) mixes indefinitely with water due to its high dipole moment. Propanal is poorly soluble in water – 20 g in 100 ml, because its dipole moment is smaller than that of acetone due to the asymmetry of the molecule.