(C) In $SF_{4}$,the central atom is $S$ (Sulfur).Sulfur has $6$ valence electrons.It forms $4$ $\sigma$-bonds with $4$ $F$ atoms.Number of lone pairs

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(C) In $SF_{4}$,the central atom is $S$ (Sulfur).Sulfur has $6$ valence electrons.It forms $4$ $\sigma$-bonds with $4$ $F$ atoms.Number of lone pairs = $(6 - 4) / 2 = 1$.Steric number = (Number of $\sigma$-bonds) + (Number of lone pairs) = $4 + 1 = 5$.$A$ steric number of $5$ corresponds to $sp^{3}d$ hybridisation.