RE-NEET 2026 Chemistry Isomerism MCQ Question
The complex which has facial and meridional isomers is (Given: py = pyridine and en = H₂N-CH₂-CH₂-NH₂)
[Cr(H₂O)₆]³⁺
[Co(NH₃)₄(H₂O)₂]³⁺
[Ni(en)₂(H₂O)₂]²⁺
[Cr(py)₃(Cl)₃]
Correct Answer
Detailed Explanation
The correct answer is D) [Cr(py)₃(Cl)₃] because it can exhibit both facial and meridional isomerism due to its octahedral geometry. In this complex, three pyridine (py) ligands and three chloride (Cl) ligands can arrange themselves in two distinct ways: facial (where two types of ligands are adjacent) and meridional (where two types of ligands are in a plane).
The other options fail to show this isomerism: A) and B) have symmetrical arrangements that do not allow for such isomers, while C) features bidentate ligands that limit the possible arrangements. Thus, only option D allows for the required isomeric forms.
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