In which of the following molecules the central atom does not have sp ^3 hybridisation?

Step-by-step solution

When the number of hybrid orbitals, H is 4 , the hybridisation is sp ^3 . H = 1 2 [ ~V + M - C + A ] where, V= number of valence electrons of central atom aligned M & = number of monovalent atoms C & = total positive charge A & = negative charge aligned (a) For CH ₄ , H = 1 2 [4+4-0+0]=4 , thus sp ^3 hybridisation (b) For SF ₄ , H = 1 2 [6+4-0+0]=5 , thus sp ^3 ~d hybridisation (c) For BF ₄⁻ , H = 1 2 [3+4-0+1]=4, thus sp ^3 hybridisation (d) For NH ₄⁺ , H= 1 2 [5+4-1+0]=4 , thus s p^3 hybridisation Thus, only in S