1. Tardigrade
  2. Question
  3. Chemistry
  4. In which of the following coordination entities the magnitude of Δ0 (CFSE in octahedral field) will be maximum? (At. no. of Co = 27)

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Q. In which of the following coordination entities the magnitude of $\Delta_0$ ($CFSE$ in octahedral field) will be maximum? (At. no. of $Co = 27$)

AIPMTAIPMT 2008Coordination Compounds

Solution:

As in all the given complex the central metal atom is same and contains same number of $d$ electrons, thus CFSE is decided by ligands. In case of strong field ligand, CFSE is maximum. $CN ^{-}$ is a strong field ligand, is maximum. The magnitude of $\Delta_{\text{oct}}$ will be maximum in $\left[ Co ( CN )_{6}\right]^{3-}$.Hence, in $\left[ Co ( CN )_{6}\right]^{3-} CFSE$