Question

Which of the following complex species does not involve inner orbital hybridisation?

• A. $\left[ CoF _{6}\right]^{3-}$
• B. $\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}$
• C. $\left[ Fe \left( CN\right)_{6}\right]^{3-}$
• D. $\left[ Cr \left( NH _{3}\right)_{6}\right]^{3+}$

Answer 1

Answer: (A)

$[CoF_{6}]^{3-}$ is a outer orbital complex ion. It involves outer orbital hybridisation. It has $sp^{3}d^{2}-$ hybridisation because $F^{-}$ is a weak ligand.