Question

Which molecule would have the largest dispersion molecules forces?

CH4, CO2, Cl2

Answer 1

Well, at a guess I would say chlorine gas, i.e. `Cl_2`....

Explanation:

Why? Because dispersion forces INCREASES as the number of electrons increase in the molecule, and this gives rise to greater possible transient polarities.

But a chemist, a scientist, interrogates data, and we should inform our argument with evidence.

The `"normal boiling point of methane"` is `-164` `""^@C`.

`"Carbon dioxide sublimes at"` `-78` `""^@C`.

The `"normal boiling point of chlorine"` is `-34.0` `""^@C`.

And so we are not far off in our speculation.....