Question

In which of the following octahedral complex of $Co$(Z = 27) will be magnitude of ${\Delta }_0$ be the highest ?

• A. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
• B. $\left[Co\right(CN{)}_6{]}^{3-}$
• C. $\left[Co\right(C_2{O}_4){]}^{3-}$
• D. $\left[Co\right(H_{2}O{)}_6{]}^{3+}$

Answer 1

The correct option is B $\left[Co\right(CN{)}_6{]}^{3-}$

$C{N}^{-}$ is the strongest of all the ligands.