Propanol has a higher boiling point (C_3H_7OH, 82.3 °C) than propane (C_3H_8, 42.1 °C). Pick the best answer why?
1) Stronger hydrogen bonding in propane than in propanol
2) Hydrogen bonding in propane but not propanol
3) Stronger dispersion forces in propanol than in propane
4) Stronger hydrogen bonding in propanol than in propane
5) Hydrogen bonding in propanol but not propane