MCQ
Which of the following compound show optical isomerism?
- Acis $-[CrCl_3 (NHI_3)_3]$
- ✓$[Co(en)_3]^{3+}$
- Ccis $- [Co(NH_3)_4Cl_2]^+$
- Dtrans $-[Co(en)_2 Cl_2]^+$

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Which of the following statements is true ?