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Which one among the following exhibits optical isomerism
A. |
`cis[Co(NH_3)4Cl_2]Cl` |
B. |
trans`[Co(NH_3)_4Cl_2]Cl` |
C. |
cis`[Co(en)_2Cl_2]Cl` |
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D. |
trans `[Co(en)_2Cl_2]Cl` |