Question

Which of the following compounds has the highest boiling point?

Answer 1

1. SnCl4
2. SiCl4
3. they all have the same boiling point
4. GeCl4
0

Answer 2

Because of the symmetry of the compounds, the dipoles cancel out and they are all non-polar. The only intermolecular forces holding them together are london dispersion (transient polarization of electron distributions). So, it's likely that they have a similar BP, but a compound with more electrons (i.e. lower on periodic table) available for polarization, will have a larger polarization and thus larger london dispersion forces.