Which one of the following metal complexes is most stable?

Question

Canvas Classes · Accepted Answer

Strategy:
 The thermodynamic stability of a complex increases remarkably when multidentate ligands form closed ring structures with the central metal. This is known as the Chelate Effect.

Step 1: Identify ligands
-  (ammine): monodentate (forms 0 rings).
- en (ethylenediamine): bidentate (forms 1 ring per ligand).

Step 2: Count chelate rings per complex
- : 3 en ligands = 3 chelate rings.
- : 2 en ligands = 2 chelate rings.
- : 1 en ligand = 1 chelate ring.
- : 0 chelate rings.

Step 3: Conclu

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