Question

Crystal field splitting energy (CFSE) for the complex $\left[Fe\right(CN{)}_4{]}^{-}$ is ____ ,when $\Delta >P$.

• A. $-2.0$
• B. $\Delta +P$
• C. $2+P$
• D. $0$

Answer 1

The correct option is D $0$

Tetrahedral complex, ${\Delta }_t>P$
Strong ligand, but pairing does not take place.
CFSE $=(0.6\times 2+0.4\times 3)t=0$