Question

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The structure of ${SF}_4$ with one lone pair on equatorial position is described formally as disphenoidal.

• A. 1

Answer 1

The correct option is A 1
Sulfur in $S{F}_4$ is in the formal +4 oxidation state. Of sulfur's total of six valence electrons, two form a lone pair. The structure of $S{F}_4$ can therefore be anticipated using the principles of VSEPR theory: it is a see-saw shape, with S at the center.
See saw is formally called disphenoidal.