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Which of the following complex has a possibility to exist as meridional isomer?

1. [Co(NH 3 ) 3 (NO 2 ) 3 ]
2. [Pt (NH 3 ) 2 Cl 2 ]
3. [Co(en) 2 Cl 2 ]
4. [Co(en) 3 ]

Correct answer: [Co(NH 3 ) 3 (NO 2 ) 3 ]

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