Why does ethanol have a higher boiling point than propanol?
It isn't; their boiling points are (ethanol) 78.4oC and (Propanol) 97.1oC. The boiling point of propanol is greater because it is the third member in the series (with 3 carbon atoms) and ethanol is the second (with 2 carbon atoms). While they have similar bonding characteristics, propanol is simply heavier.
It depends what chemical or compound you are comparing the boiling point to. Ethanol has an atmospheric pressure boiling point of 78.1 °C (172.6 °F). This is slightly lower than the boiling point of water at the same pressure, much lower than the boiling point of iron, much higher than the boiling point of bromine.
No. For example, ethanol (CH3CH2OH) and dimethyl ether (CH3OCH3) are structural isomers but have different boiling points. (The boiling point of ethanol is much higher than the boiling point of dimethyl ether because ethanol molecules can form hydrogen bonds with each other while dimethyl ether molecules cannot.)
Boiling points: Propanol: 97.1 oC Isopropanol: 82.3 oC So yes, propanol has a higher boiling point than isopropanol. Since both isomers can hydrogen bond, the difference may be due to the fact that propanol, due to its more linear shape, is able to pack more densely than isopropanol (as verified by propanol's density of 0.803 g/ml vs. isopropanol's 0.786 g/ml) and experience more London Dispersion forces.
The boiling point of ethanol is 78.4 degrees celcius at 1.0 atm. (760mmHg) pressure There is not one boiling temperature, because it depends on the overlaid gas pressure (normally air, but that is not important). The given boiling POINT is a temperature at a certain pressure, this is just one POINT of the (so called) p,T-line of all pressures and temperatures possible for boiling ethanol