JEE MAIN - Chemistry (2023 - 11th April Morning Shift - No. 14)
Which of the following complex has a possibility to exist as meridional isomer?
$$\mathrm{[Pt(NH_3)_2Cl_2]}$$
$$\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]$$
$$\left[\mathrm{Co}(\mathrm{en})_{3}\right]$$
$$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]$$
Explanation
Meridional (mer) isomerism is a type of geometrical isomerism found specifically in octahedral complexes, where three identical ligands occupy a meridian plane. Thus, it requires at least three identical bidentate or monodentate ligands.
Given the options, the complex that could potentially exist as a meridional isomer is :
Option D : $[\mathrm{Co}(\mathrm{NH}_{3})_{3}(\mathrm{NO}_{2})_{3}]$
In this complex, there are three $\mathrm{NH_3}$ and three $\mathrm{NO_2}$ ligands, allowing it to form a meridional configuration where either all three $\mathrm{NH_3}$ or all three $\mathrm{NO_2}$ ligands lie along a meridian plane.
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