MHT CET 2025 Chemistry question

Which from following cations forms least stable complex with same ligand?

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

For divalent first-row transition metal ions, the stability of complexes with the same ligand follows the Irving-Williams order: \mathrm{Mn^{2+} < Fe^{2+} < Co^{2+} < Ni^{2+} < Cu^{2+} > Zn^{2+}}. From the given cations, forms the most stable complexes (D), then (A), and

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Question ID VK-101800