Which of the following complex has a possibility to exist as meridional isomer?

Question

Canvas Classes · Accepted Answer

Strategy:
 Facial (fac) and meridional (mer) isomerism is a type of geometrical isomerism found specifically in octahedral complexes with the general formula .

Step 1: Examine the formulas
- : Square planar ()  only cis/trans.
- : Octahedral ()  only cis/trans (plus optical for cis).
- : Octahedral ()  only optical (d and l).
- : Octahedral ().
  - If three identical ligands occupy one face of the octahedron, it is facial (fac).
  - If three identical ligands occupy a meridian (equator), it is

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