Which of the following compounds exhibits linkage isomerism?

[C o (e n)_{3}] C l_{3}

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[C o (N H_{3})_{6}] [C r (e n)_{3}]

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[C o (e n)_{2} (N O_{2}) C l] B r

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[C o (N H_{3})_{5} C l] B r_{2}

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Solution

The correct option is A $[C o (e n)_{2} (N O_{2}) C l] B r$
Linkage isomers are coordination compounds with the same composition. But the connectivity of metal to the ligand is different.
$[C o (e n)_{2} (N O_{2}) C l] B r$ and $[C o (e n)_{2} (O N O) C l] B r$ are linkage isomers. In $[C o (e n)_{2} (N O_{2}) C l] B r$ , $N O_{2}$ ligand is coordinated through $N$ atom. In $[C o (e n)_{2} (O N O) C l] B r$ , $O N O$ ligand is coordinated through $O$ atom.

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