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The given compound may have linkage isomerism due to presence of NO2 group which may be in the form –NO2 or –ONO. It may have ionisation isomerism due to presence of two ionisable groups –NO2 & –Cl. It may have geometrical isomerism in the form of cis-trans form.

1. [Co(NH3)4Cl(NO2)]NO2 & [Co(NH3)4(NO2)2]Cl — ionisation isomers.
2. [Co(NH3)4(NO2)2]Cl & [Co(NH3)4(ONO)2]Cl — linkage isomers.
3. Non superimposable mirror images are called optical isomers and may be described as 'chiral'.
4. The octahedral coordination compounds of the type MA3B3 exhibit fac-mer isomerism.

Correct answer: [Co(NH3)4(NO2)2]Cl & [Co(NH3)4(ONO)2]Cl — linkage isomers.

Solution

Option B correctly describes linkage isomerism, as the NO2 group can bind through N (-NO2) or O (-ONO). This is a classic example of linkage isomerism in coordination compounds.

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