Question

Which of the following complex ion possesses sp ${}^3{d}^2$ hybridization?

• A. ${\left[Cr{\left(N{O}_2\right)}_6\right]}^{3-}$
• B. ${\left[Fe(CN{)}_6\right]}^{4-}$
• C. ${\left[Fe{F}_6\right]}^{3-}$
• D. $\left[Ni(CO{)}_4\right]$

Answer 1

Answer: (C)

${\left[Fe{F}_6\right]}^{3-}$ complex ion possesses sp ${}^3{d}^2$ hybridization.
The electronic configurations of $Cr,Fe,Co$ and $Ti$ in the complexes are
$(3d{)}^3,(3d{)}^5,(3d{)}^6$ and $(3d{)}^1$, respectively.
These involve $d^{2}s{p}^3,s{p}^3{d}^2,d^{2}s{p}^3$ and $d^{2}s{p}^3$ hybridization respectively.