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Chemistry Question on coordination compounds

Which one of the following has an optical isomer?

A

[Zn(en)2]2+[Zn(en)_2]^{2+}

B

[Zn(en)(NH3)2]2+[Zn(en)(NH_3)_2]^{2+}

C

[Co(en)3]3+[Co(en)_3]^{3+}

D

[Co(H2O)4(en)]3+[Co(H_2O)_4(en)]^{3+}

Answer

[Co(en)3]3+[Co(en)_3]^{3+}

Explanation

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, [Ma2b2c2]n±,[Mabcdef],[M(AA)3]n±,[M(AA)2a2]n±,[M(AA)2ab]n±\left[Ma_{2}b_{2}c_{2}\right]^{n\pm}, \left[Mabcdef\right],\left[M\left(AA\right)_{3}\right]^{n\pm}, \left[M\left(AA\right)_{2}a_{2}\right]^{n\pm}, \left[M\left(AA\right)_{2}ab\right]^{n\pm} and [M(AB)3]n±.\left[M\left(AB\right)_{3}\right]^{n\pm}. Thus, among the given options, only [Co(en)3]3+[Co(en)_3]^{3+} shows optical isomerism.