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Which of the following does not have optical isomer?

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Which of the following does not have optical isomer?
A. `[Co(NH_(3))_(3)Cl_(3)]`
B. `[Co(En)_(2)Cl_(3)]`
C. `[Co(en)_(2)Cl_(2)]Cl`
D. `[CO(en)(NH_(3))_(2)Cl_(2)]Cl.`
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Correct Answer - A
Coordination compounds which must have centre of symmetry are optically unactive . In CN = 6 due to presence of chelating ring it most make it non-superimposable on narrow image so that except `[Co(NH_(3))_(3)Cl_(3)]` others are optically active.
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