Which of the following has largest number of isomers?

[Ru(NH₃)₄Cl₂]⁺

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[Co(en)₂Cl₂] ⁺

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[Ir(PR₃)2H(CO)]²⁺

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[CO(NH₃)5Cl]⁺²

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Solution

The correct option is B
[Co(en)₂Cl₂] ⁺

All given compounds have cis and trans isomers but only cis-isomer of (b) will have optical isomers (d and l). Also due to presence of symmetrical bidentate ligand (en).

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