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Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

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

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

Solution

Optical isomerism arises in complexes that lack a plane of symmetry. Among the given options, cis-[Co(en)2Cl2] has a chiral arrangement due to the bidentate ethylenediamine ligands and the cis configuration, making it optically active.

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