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Which of the following will give a pair of enantiomers?

1. [Cr(NH3)4][Co(CN)6]
2. [Co(en)2Cl2]Cl
3. [Pt(NH3)4][PtCl4]
4. [Co(NH3)4Cl2]NO2 (en = NH2CH2CH2NH2)

Correct answer: [Co(en)2Cl2]Cl

Solution

The compound [Co(en)2Cl2]Cl contains a bidentate ligand (en) and can exhibit optical isomerism, forming a pair of enantiomers due to its chiral geometry.

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