In which of the following octahedral complexes of cobalt (atomic number 27) will the magnitude of $Δ_{0}$ be the highest?

[C o (N H_{3})_{6}]^{3 +}

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[C o (C N)_{6}]^{3 +}

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[C o (C_{2} O_{4})_{3}]^{3 +}

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[C o (H_{2} O)_{6}]^{3 +}

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Solution

The correct option is B $[C o (C N)_{6}]^{3 +}$
$Δ_{0}$ depends upon ligands because they cause large crystal field splitting depending upon their position in spectrochemical series i.e $C N^{-}$ > $N H_{3}$ > $H_{2} O$ > $C_{2} O_{4}^{2 -}$

Greater the donating nature of ligand greater will be the ligand strength and therefore higher will the CFSE in octahedral complex.

Hence,option B is correct.

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Similar questions

Q. In which of the following octahedral complexes of

C o

(Z = 27) will the magnitude of

Δ_{0}

be the highest?

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, $[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
(a) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$
(b) $[C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +}$
(c) $[C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +} > [C o (C N)_{6}]^{3 -}$
(d) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$

Q. In which of the following octahedral complexes of

C o

(Z = 27) will the magnitude of

Δ_{0}

be the highest?

Q. In which of the following octahedral complex of

C o

(Z = 27) will be magnitude of

Δ_{0}

be the highest ?

Q. In which of the following octahedral complexes of Co (atomic number 27), will the magnitude of

Δ_{o}

be the highest?

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In which of the following octahedral complexes of cobalt (atomic number 27) will the magnitude of Δ0 be the highest?

In which of the following octahedral complexes of cobalt (atomic number 27) will the magnitude of $Δ_{0}$ be the highest?