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

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${[Ru {({NH}_{3})}_{4} {Cl}_{2}]}^{+}$

${[Co {({NH}_{3})}_{5} Cl]}^{2 +}$

${[Co (en)_{2} {Cl}_{2}]}^{+}$

${[Ir {({PR}_{3})}_{2} H (CO)]}^{2 +}$

answer is D.

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Detailed Solution

[Co(en)₂Cl₂]⁺ has largest number of isomers which includes geometrical isomers (cis and trans isomers) as well as stereoisomers (d form, l form and optically inactive form).

The complex ${[Co (en)_{2} {Cl}_{2}]}^{+} s$ shows geometrical as well as optical isomers.

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