Which Compound Has the Highest Boiling Point and Why?

[Jbreezy]

Homework Statement

Arrange compunds in order of increasing boiling points and explain why.
C2Br6,C2F6,C2I6,C2Cl6

Homework Equations

The Attempt at a Solution

I have C2Cl6 < C2Br6 < C2I6 < C2F6

My explanation is as follows. C2F6 is highest because it has dipole dipole forces. Which are stronger then London forces. All the others just posse London forces. So I went by molar mass the heavier the more energy required to reach its boiling point ( to break the London dispersion force.)

Please let me know if I think OK.

 

[Seydlitz]

I don't think only C2F6 has dipole-dipole force. If you check the electronegativity of halogen versus carbon, I'm certain all of them has skewed charge distribution. But then consider again the geometry of the molecules, and check whether your conclusion is right because all of them is symmetrical in nature.