Identify from the following species in which $\mathrm{d}^{2} \mathrm{sp}^{3}$ hybridization is shown by central atom:

(A) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$

(C) $\left[\mathrm{Pt}(\mathrm{Cl})_{4}\right]^{2-}$

JEE Main · 2024 · 27 Jan 2024 · Shift 2 · Coordination Compounds

Identify from the following species in which

d^{2} sp^{3}

hybridization is shown by central atom:

Answer: (A)

[C o (N H_{3})_{6}]^{3 +}

C o^{3 +}

d^{6}

; the strong-field ligand

N H_{3}

pairs these six electrons into the three

t_{2 g}

orbitals, freeing the two

e_{g}

orbitals to combine with one s and three p orbitals — octahedral

d^{2} s p^{3}

hybridisation.

B r F_{5}

: bromine has 5 bond pairs and 1 lone pair around it, giving

s p^{3} d^{2}

hybridisation (square pyramidal).

[P tC l_{4}]^{2 -}

P t^{2 +}

d^{8}

; with the strong-field

C l^{-}

/square-planar arrangement it adopts

d s p^{2}

hybridisation.

S F_{6}

: sulfur forms 6 bond pairs, giving octahedral

s p^{3} d^{2}

hybridisation.

Only

[C o (N H_{3})_{6}]^{3 +}

shows

d^{2} s p^{3}

hybridisation at the central atom.

JEE Main · 2024 · 27 Jan 2024 · Shift 2 · Single correct option