Which molecule in each pair(See the whole question) has the greater dipole moment?

Question

1.) ClO2 or SO2
2.) HBr or HCl
3.) BeCl2 or SCl2
4.) AsF3 or AsF5

(Please show why one is more dipole then the other)

Answer 1

1.) ClO2, because the O=Cl=O angle is 90deg whereas O=S=O is linear, 180deg
2.) HCl, because Cl is more electronegative than Br
3.) SCl2, because the Cl-S-Cl angle is 90deg, whereas Cl-Be-Cl is linear, 180deg
4.) AsF3, because As sits at the top of a tripod of F atoms, whereas AsF5 is symmetrical.

Answer 2

1. I'm not sure. I thing SO2 because is angular. Perhaps ClO2 is linear, so it has a zero dipole moment but I'm not sure.

2. HCl because Cl is more electronegative than Br.

3. SCl2 because it's angular. BeCl2 Is linear so its dipole moment equals to zero.

4. AsF3 because of its shape: pyramidal. AsF5 with a trigonal bipyramidal shape has dipole moment = 0.

Answer 3

You are looking for the greatest difference in electronegativity.
ClO2
HCl
BeCl2
AsF5