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The octahedral coordination compounds of the type MA3B3 exhibit fac-mer isomerism.

1. Tetrahedral complexes are symmetrical in all directions. Thus, cannot show geometrical isomerism.
2. The octahedral coordination compounds of the type MA3B3 exhibit fac-mer isomerism.
3. Non superimposable mirror images are called optical isomers and may be described as 'chiral'.
4. The given compound may have linkage isomerism due to presence of NO2 group which may be in the form –NO2 or –ONO.

Correct answer: The octahedral coordination compounds of the type MA3B3 exhibit fac-mer isomerism.

Solution

Octahedral complexes of the type MA3B3 can exhibit fac-mer isomerism because the three A ligands and three B ligands can be arranged either adjacent to each other (facial) or opposite to each other (meridional).

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