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Question

Complex compound [Co(SCN)2(NH3)4]Cl exhibits.

A
Ionization isomerism
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B
Geometrical isomerism
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C
Optical isomerism
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D
Linkage isomerism
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Solution

The correct options are
A Ionization isomerism
B Geometrical isomerism
D Linkage isomerism
The complex [Co(SCN)2(NH3)4]Cl exhibits ionization isomerism, geometrical isomerism as well as linkage isomerism.
Linkage isomerism is possible as SCN ligand is ambidentate ligand and has two donor atoms N and S.
Ionization isomerism is possible due to exchange of ions inside and outside the coordination sphere.
Two geometrical isomers cis and trans are possible. In the cis isomer, the two SCN ligands are adjacent to each other and in the trans isomer, they are opposite to each other.

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