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Non superimposable mirror images are called optical isomers and may be described as 'chiral'. They are also called enantiomers and rotate plane polarised light in opposite directions.

1. Tetrahedral complexes are symmetrical in all directions. Thus, cannot show geometrical isomerism.
2. Non superimposable mirror images are called optical isomers and may be described as 'chiral'.
3. The octahedral coordination compounds of the type MA3B3 exhibit fac-mer isomerism.
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: Non superimposable mirror images are called optical isomers and may be described as 'chiral'.

Solution

Option B is correct because it directly defines optical isomers as non-superimposable mirror images, which are chiral. This matches the description provided in the question.

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