Why does SO2 molecules have dipole-dipole interations?

[EvaLi_3J]

Are they polar molecules due to lone pairs?

[Ronak Naik]

Yes, the presence of lone pairs usually renders a molecule to be polar since the atom with the lone pairs will be a more negative charge. Another example would be water!

[Sjeffrey_1C]

Yes, and since it's polar that means there's a separation of charges. The S is partial positive and the Os are partial negative.

[Junxi Feng 3B]

Most of the time, polar molecules will be the molecules with different different elements, such as SO2 in this case, H2O, HCl, and so on. But for the best way, you will have to draw out the lewis structure to determine, such as for CH4, you will have to draw it out to see that all its dipole moment cancels out.
In this case, SO2 if you draw out the lewis structure, it has a lone pair on top of S, this lone pair repels the two oxygens at both sides, making it slightly bent, meaning the dipole moment between S=O bonds cannot cancel out. Therefore, SO2 is polar and has dipole dipole interactions.

[Junwei Sun 4I]

SO2 molecules have dipole-dipole interactions because they are polar. When drawing out the lewis structure for SO2 the central atom S has one lone pair, which means it's polar.