Question

BF3 and NF4 both the compounds are covelent but BF3 is non-polar and NF3 is polar, why?​

Answer 1

Answer:

A polar molecule results from an unequal/unsymmetrical sharing of valence electrons. While there may be unequal sharing of electrons in the individual bonds, in a nonpolar molecule like BF3 these bonds are evenly distributed and cancel out. There is no net dipole and the BF3 is non-polar.