Which of the following exhibits linkage isomerism?

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

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

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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_{5}

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Solution

The correct option is C $[C o (e n)_{2} N O_{2} C l] B r$
You know that the ligand $N O_{2}$ can also exist as the $O N O$ group which is known as the nitrito - O group. This is clearly an ambidentate ligand.
What is this type of isomerism? Linkage isomerism, right? So these are the different isomers that can exist.
$[C o (e n)_{2} N O_{2} C l] B r$ and $[C o (e n)_{2} (O N O) C l] B r$

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