If I have CCl2, I know that the answer is that it has dispersion intermolecular force. I'd like to state my reasoning for this~
CCl2 is made up of 4 polar bonds. Usually, polar bonds would create a dipole-dipole force; however, since CCl2 is overall nonpolar, it gives it a dispersion force. Is this correct?
And if this is correct, can I apply this logic to everything else? For instance:
1) Figure out what each of the bonds are.
2) Figure out whether the structure is overall nonpolar or polar
3) If it is overall nonpolar it is dispersion and if it is overall polar, it is dipole-dipole.

Question

If I have CCl2, I know that the answer is that it has dispersion intermolecular force. I'd like to state my reasoning for this~
CCl2 is made up of 4 polar bonds. Usually, polar bonds would create a dipole-dipole force; however, since CCl2 is overall nonpolar, it gives it a dispersion force. Is this correct? 
And if this is correct, can I apply this logic to everything else? For instance: 
1) Figure out what each of the bonds are. 
2) Figure out whether the structure is overall nonpolar or polar
3) If it is overall nonpolar it is dispersion and if it is overall polar, it is dipole-dipole.