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

1. [Co(NH 3 ) 3 Cl 3 ]
2. [Co(en)(NH 3 ) 2 Cl 2 ] +
3. [Co(en) 3 ] 3+
4. [Co(en) 2 Cl 2 ] +

Correct answer: [Co(NH 3 ) 3 Cl 3 ]

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