Question

What is the relationship between dipole moment and boiling point?

Answer 1

The lower the dipole moment, the higher the boiling point. If dipole moment is high, there can be repulsion(steric) between adjacent molecules, preventing a closed packed structure.

Answer 2

Well thats not the proper reason, packing fraction affects melting point not boiling point.

Answer 3

And the answer is also wrong, more dipole more boiling point, This is because there are stronger inter molecular forces if there is more dipole moment (Dipole Dipole interactions). Hence dipole is directly proportional to boiling point).

Answer 4

Wait a minute, I thought dipole moment had to do with electronegativity as opposed to bonding. Like for instance CaBr2 is more polar than MgS which means that CaBr2 has a greater dipole moment right? And then in order for a molecule can have dipole-dipole intermolecular attractions, in the first place, it has to be polar. Okay, I get it now, thanks! :)

Answer 5

Actually dipole moment has more to do with shape of a molecule rather than eletro negativity. Just because CaBr2 is more polar does not mean that it could have higher dipole moment than MgS It depends on shape.
Lets take CCl4 and CCl3-. Now CCl4 you would think is more polar because of 4 Chlorine but it has 0 dipole moment as all individual dipoles cancel whereas in CCl3- there is a net dipole moment which is non zero. That should make it more clear.