The number of stereoisomers possible for $[C o (o x)_{2} (B r) (N H_{3})]^{2 -}$ is____.
[ox = oxalate]

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Solution

The possible stereoisomers of the $[C o (o x)_{2} (B r) (N H_{3})]^{2 -}$ complex is given below.
The isomers with no plane of symmetry or centre of symmetry is optically active. Hence, it will have a non-superimposable mirror image.
Isomer at the bottom has plane of symmetry hence it is a meso form.

Total stereoisomer = 2 (O.A) (pair of enantiomers) + 1 meso = 3

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