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Which one of the following complexes will have four different isomers?

1. [Co(en)2Cl2]Cl
2. [Co(en)(NH3)2Cl2]Cl
3. [Co(PPh3)2Cl2]Cl
4. [Co(en)3]Cl3

Correct answer: [Co(en)(NH3)2Cl2]Cl

Solution

The complex [Co(en)(NH3)2Cl2]Cl can exhibit four different isomers: two geometric isomers (cis and trans) and two optical isomers for the cis form. The other complexes do not meet these criteria.

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