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Which one of the following complexes exhibits optical isomerism?

1. [Co(CN)6]3−
2. [Cr(C2O4)3]3−
3. [ZnCl4]2−
4. [Cu(NH3)4]2+

Correct answer: [Cr(C2O4)3]3−

Solution

[Cr(C2O4)3]3− exhibits optical isomerism because it has a chiral arrangement of ligands around the chromium center, allowing for non-superimposable mirror images. In contrast, the other complexes either have symmetrical arrangements or do not possess chirality.

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