How do you know which molecules have higher boilingpoints? From What I know, is

Question

How do you know which molecules have higher boilingpoints? From What I know, is that you can tell if they have: 1. Difference in Electronegativity, The higher the higherboiling points they have 2. If they are hydrogen bonds 3. Calculate through number of electrons however, they don't always work, for example: Arrange the following compounds in order of increasing boilingpoints: RbF, CO2, CH3OH, CH3Br If you set them up using difference of eletronegativity, youwould get: CH3Br < CO2 < CH3OH< RbF But in fact, the right answer is actually: CO2 < CH3Br < CH3OH< RbF But if you set them up using number of electrons, theybecome CH3OH < CO2 < CH3Br< RbF But if you set them up using: Polar < Hydrogen < Ionic It works, so what is the universal way of doing it? How do you know which molecules have higher boilingpoints? From What I know, is that you can tell if they have: 1. Difference in Electronegativity, The higher the higherboiling points they have 2. If they are hydrogen bonds 3. Calculate through number of electrons however, they don't always work, for example: Arrange the following compounds in order of increasing boilingpoints: RbF, CO2, CH3OH, CH3Br If you set them up using difference of eletronegativity, youwould get: CH3Br < CO2 < CH3OH< RbF But in fact, the right answer is actually: CO2 < CH3Br < CH3OH< RbF But if you set them up using number of electrons, theybecome CH3OH < CO2 < CH3Br< RbF But if you set them up using: Polar < Hydrogen < Ionic It works, so what is the universal way of doing it?

Explanation / Answer

We Know that :

      The factors which influence theboiling point of the molecules is :

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