MHT CET · Chemistry · Coordination Compounds

Which from following is a correct stability order of complex formed by metal ions if the ligand remains same?

A \(\mathrm{Fe}^{2+}\gt\mathrm{Mn}^{2+}\gt\mathrm{Co}^{2+}\)
B \(\mathrm{Co}^{2+}\gt\mathrm{Fe}^{2+}\gt\mathrm{Mn}^{2+}\)
C \(\mathrm{Co}^{2+}\gt\mathrm{Mn}^{2+}\gt\mathrm{Fe}^{2+}\)
D \(\mathrm{Fe}^{2+}\gt\mathrm{Co}^{2+}\gt\mathrm{Mn}^{2+}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\mathrm{Co}^{2+}\gt\mathrm{Fe}^{2+}\gt\mathrm{Mn}^{2+}\)

Step-by-step Solution

Detailed explanation

The stability order of divalent metal ion complexes is given by Irving William series. Higher the charge to size ratio, greater is the stability of complex.
Hence, the order is \(\mathrm{Co}^{2+}\gt\mathrm{Fe}^{2+}\gt\mathrm{Mn}^{2+}\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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