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Which one of the following complexes shows optical isomerism? (1) [Co(NH3)3Cl3] (2) cis-[Co(en)2Cl2]Cl (3) trans-[Co(en)2Cl2]Cl (4) [Co(NH3)4Cl2]Cl

1. [Co(NH3)3Cl3]
2. cis-[Co(en)2Cl2]Cl
3. trans-[Co(en)2Cl2]Cl
4. [Co(NH3)4Cl2]Cl

Correct answer: cis-[Co(en)2Cl2]Cl

Solution

Cis-[Co(en)2Cl2]Cl exhibits optical isomerism because it has a chiral arrangement due to the presence of two bidentate ethylenediamine (en) ligands, which creates non-superimposable mirror images.

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