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Q.
Which one of the following has an optical isomer?
Coordination Compounds
Solution:
Optical isomers rarely occur in square planar complexes due to the presence of axis of symmetry. Optical isomerism is common in octahedral complexes of the general formula, $\left[ Ma _{2} b _{2} c_{2}\right]^{n \pm},[ Mabcdef ]^{n \pm},\left[M(A A)_{3}\right]^{n \pm},$ $\left[M(A A)_{2} a_{2}\right]^{n \pm},\left[M(A A)_{2} a b\right]^{n \pm}$ and $\left[M(A B)_{3}\right]^{n \pm} .$ Thus, among the given options, only $\left[ Co (e n)_{3}\right]^{3+}$ shows optical isomerism.
