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Question

The complex that can show fac- and mer-isomers is

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A
[Co(NH3)3(NO2)3]
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B
[Pt(NH3)2Cl2]
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C
[CoCl2(en)2]
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D
[Co(NH3)4Cl2]+
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Solution

The correct option is A [Co(NH3)3(NO2)3]
Octaherdral geometry of type [Ma3b3] where a and b are unidentate ligands, shows facial and meridional isomers.
Facial isomer have three identical ligands on one triangular face.
Meridional isomer have three identical ligands in a plane bisecting the molecule.
Thus, [Co(NH3)3(NO2)3] will show fac and mer isomers



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