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# Which one of the following has largest no of isomers

$\begin{array}{1 1}(a)\;[Ru(NH_3)_4Cl_2^+]\\(b)\;[CO(en)_2Cl_2]^+\\(c)\;[Ir(PR_3)_2H(CO)]^{2+}\\(d)\;[CO(NH_3)_5Cl]^{2+}\end{array}$

$[CO(en)_2Cl_2]^+$ has largest no of isomers.
Hence (b) is the correct answer.