MCQ
Which of the following compounds shows optical isomerism
- A${[Cu{(N{H_3})_4}]^{2 + }}$
- B${[ZnC{l_4}]^{2 - }}$
- ✓${[Cr{({C_2}{O_4})_3}]^{3 - }}$
- D${[Co{(CN)_6}]^{3 - }}$

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