Question

which of the following molecule is theoretically not possible?why? a)SF4 b)OF2 C)OF4 d)O2F2

Answer 1

The answer to this question is SF4.

It is because all of the bonds in this term SF4 are not equivalent.  In fact, the total of 6 valence electrons of sulphur forms the longest pair.

The overall structure of this term can hence be anticipated using the VSEPR theory principles. It has see-saw shape with S at the focal point.