Question:
Match the following lists: A) $[MnCl_6]^{3-}$, B) $[Mn(CN)_6]^{3-}$, C) $[Fe(CN)_6]^{4-}$, D) $[CoF_6]^{3-}$ with their d-electronic configurations.
Match the following lists: A) $[MnCl_6]^{3-}$, B) $[Mn(CN)_6]^{3-}$, C) $[Fe(CN)_6]^{4-}$, D) $[CoF_6]^{3-}$ with their d-electronic configurations.
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Strong field ligands ($CN^-$) cause pairing; weak field ligands ($Cl^-$, $F^-$) do not!
Updated On: Jun 6, 2026
- A-III, B-IV, C-I, D-II
- A-III, B-IV, C-II, D-I
- A-II, B-III, C-IV, D-I
- A-II, B-I, C-IV, D-III
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Crystal Field Theory (CFT) and electron configuration of octahedral complexes.
Step 2: Meaning
Determine high-spin vs. low-spin based on ligand field strength.
Step 3: Analysis
$Mn^{3+}$ ($d^4$): $[MnCl_6]^{3-}$ (weak field, $t_{2g}^3 e_g^1$, III). $[Mn(CN)_6]^{3-}$ (strong field, $t_{2g}^4 e_g^0$, IV). $Fe^{2+}$ ($d^6$): $[Fe(CN)_6]^{4-}$ (strong field, $t_{2g}^6 e_g^0$, II). $Co^{3+}$ ($d^6$): $[CoF_6]^{3-}$ (weak field, $t_{2g}^4 e_g^2$, I).
Step 4: Conclusion
Matches are A-III, B-IV, C-II, D-I.
Final Answer: (B)
Crystal Field Theory (CFT) and electron configuration of octahedral complexes.
Step 2: Meaning
Determine high-spin vs. low-spin based on ligand field strength.
Step 3: Analysis
$Mn^{3+}$ ($d^4$): $[MnCl_6]^{3-}$ (weak field, $t_{2g}^3 e_g^1$, III). $[Mn(CN)_6]^{3-}$ (strong field, $t_{2g}^4 e_g^0$, IV). $Fe^{2+}$ ($d^6$): $[Fe(CN)_6]^{4-}$ (strong field, $t_{2g}^6 e_g^0$, II). $Co^{3+}$ ($d^6$): $[CoF_6]^{3-}$ (weak field, $t_{2g}^4 e_g^2$, I).
Step 4: Conclusion
Matches are A-III, B-IV, C-II, D-I.
Final Answer: (B)
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