is CBr2F2 polar or nonpolar?

Answer 1

It is slightly polar, that is the net diploe moment is not exactly 0.
F is much more electronegtive than Br. Thus the C-F bonds are much more polarized than the C-Br. This means that although the geometry is such (tetrahedral) that the dipole moments of the individual bonds "counter-act" each other, they cannot cancel out completely since not all of the bonds are identical.

It is similar to CH2Cl2

Answer 2

I would think it is non-polar because the geometry is tetrahedral, and the Br2 and F2 are surrounding the Carbon atom. The dipoles should cancel each other out.