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Which of the following complex species is not expected to exhibit optical isomerism ?

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

Correct answer: [Co(NH3)3Cl3]

Solution

[Co(NH3)3Cl3] does not exhibit optical isomerism because it has a symmetrical arrangement of ligands, leading to a lack of non-superimposable mirror images, which is a requirement for optical isomerism.

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