Which of the following is a polar molecule?

Molecule having defi nite dipole moment is unsymmetrical and polar.
Symmetrical molecules are having zero dipole moment and is non-polar in nature.
SF₄
4 bond pair
1 lone pair
Unsymmetrical $\mu \ne 0$
Polar molecule
(1) ${\mathrm{SiF}}_4$       4 bpe-
                      Tetrahedral sp3
                      Non polar $(\mu =0)$
(2) ${\mathrm{XeF}}_4$       4bpe-
                        2 lpe-
                        Square planar sp3d2
                        Non polar $(\mu =0)$
(3) ${\mathrm{BF}}_3$          3 bpe
                        sp2
                        Trigonal planar $(\mu =0)$