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Among the following coordination compounds, which one can exist in the greatest number of isomeric forms?

1. [Ir(PR3)2H(CO)]2+
2. [Co(NH3)5Cl]2+
3. [Ru(NH3)4Cl2]+
4. [Co(en)2Cl2]+

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

Solution

The compound [Co(en)2Cl2]+ can exhibit both geometric and optical isomerism due to the presence of the bidentate ligand ethylenediamine (en), which allows for multiple arrangements of the ligands around the cobalt center, leading to a greater variety of isomeric forms compared to the other options.

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