Question

In octahedral complexes for which of the following configuration of central metal atom magnitude of crystal field stabilization energy (CFSE) is maximum in presence of ligand ${CN}^{-}$?

• A. $d^5$
• B. $d^6$
• C. $d^{10}$
• D. $d^9$

Answer 1

Answer: (B)

$d^6$

In the presence of strong field ligand the maximum energy occurs when all elements are in $t_{2g}$ level.

So, $d^6$ has all the electrons in $t_{2g}$ level.