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Question

Which of the following exhibits linkage isomerism?

A
[Co(en)3]Cl3
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B
[Co(NH3)6][Cr(Cl)6]
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C
[Co(en)2NO2Cl]Br
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D
[Co(NH3)5Cl]Br5
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Solution

The correct option is C [Co(en)2NO2Cl]Br
You know that the ligand NO2 can also exist as the ONO 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.
[Co(en)2NO2Cl]Br and [Co(en)2(ONO)Cl]Br

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