Which one the following has largest number of isomers? (R = alkyl group, en = ethylenediamine)

Question

[Ru(NH₃)₄Cl₂]⁺

[Co(en)₂Cl₂]⁺

[Ir(PR₃)₂ H(CO)]²⁺

[Co(NH₃)₅Cl]²⁺

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