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Which of the following does not show optical isomerism?

1. [Co(NH3)3Cl3]0
2. [Co(en)2Cl2]+
3. [Co(en)3]3+
4. [Co(en)2Cl]+

Correct answer: [Co(NH3)3Cl3]0

Solution

Optical isomerism arises in complexes that lack a plane of symmetry. [Co(NH3)3Cl3]0 is a symmetrical complex and does not exhibit optical isomerism, unlike the others which involve bidentate ligands like ethylenediamine (en).

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