Question

Of the following compounds, which would you expect to have the lowest vapor pressure at room temperature: CHCl3 , CH2Cl2, CH3Cl or CCl4 ? Hint: base your decision mainly on dispersion forces.

I believe the answer is CH3Cl but I am not quit sure. Please help

Answer 1

ch3cl does have the lowest vapour pressure because the molecule has space for 3 hydrogen bonds which require a lot of energy to break up the molecule so that it can evaporate and thus hydrogen bonding causes a low vapour pressure