Which of the following compounds show optical isomerism?

{[C o {(C N)}_{6}]}^{3 -}

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{[C r {(C_{2} O_{4})}_{3}]}^{3 -}

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{[Z n {C l}_{4}]}^{2 -}

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{[C u {({N H}_{3})}_{4}]}^{2 +}

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Solution

The correct option is C ${[C r {(C_{2} O_{4})}_{3}]}^{3 -}$
The compound ${[C r {(C_{2} O_{4})}_{3}]}^{3 -}$ shows optical isomerism because its mirror image is not superimposable. It is the complex of the type $[M (A A)_{3}]^{n \pm}$ . Three symmetrical bidenate ligands (oxalate ligands) are attached to Cr atom. The complex is optically active and exists in the form of d and l isomers.

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