6.23. The permanent dipole moment of CH2F2(1.93D) is larger than that of CH2Cl2(1.60D), yet the boiling point of CH2Cl2 (40 C) is much higher than that of CH2F2(52C). Why? 6.26. What kinds of intermolecular forces must be overcome as (a) solid CO2 sublimes, (b) CHCl3 boils, and (c) ice melts? *6.36. The Smell of the Sea The distinct odor of the seashore at low tide is due in part to the presence of dimethyl sulfide, CH3SCH3 (boiling point, 310K ), a molecule with the same structure as dimethyl ether, CH3OCH3 (boiling point, 250K ). Why is the boiling point of dimethyl ether lower than the boiling point of dimethyl sulfide? 6.37. Why do molecules of methanol (CH3OH) form hydrogen bonds, but molecules of methane (CH4) do not