The number of stereo isomers possible for is (ox = oxalate)

Question

The number of stereo isomers possible for  is  (ox = oxalate)

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Strategy:
 Identify geometrical arrangements for an octahedral complex with two identical bidentate ligands and two different monodentate ligands (), and check each for chirality to count total stereoisomers.

Step 1: Geometrical isomers
The complex  can exist in two relative arrangements based on the monodentate ligands ( and ):
- trans-isomer:  and  are opposite ().
- cis-isomer:  and  are adjacent ().

Step 2: Optical isomers (Chirality)
- The trans-isomer possesses a plane of symmetry passin

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