Which of the following has an optical isomer?

[C o (H_{2} O)_{4} (e n)]^{3 +}

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[C o (e n)_{2} (N H_{3})_{2}]^{3 +}

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[C o (C N)_{4}]^{2 -}

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[C o (e n) (N H_{3})_{2}]^{2 +}

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Solution

The correct option is B $[C o (e n)_{2} (N H_{3})_{2}]^{3 +}$

The cis form of $[C o (e n)_{2} (N H_{3})_{2}]^{3 +}$ lacks in symmetry as can be seen from the diagram, thus it is optically active.

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