Question

Which of the following compounds show optical isomerism?

Options

• [Cu(NH₃)₄]³⁻

• [ZnCl₄]²⁻

• [Cr(C₂O₄)₃]³⁻

• [Co(CN)₆]³⁻

• [Cu(NH₃)₄]²⁺

Answer 1

[Cr(C₂O₄)₃]³⁻ 

Explanation:

Only [Cr(C₂O₄)₃]³⁻ shows optical isomerism because it has three bidentate oxalate ligands in an octahedral arrangement, giving non-superimposable Λ and Δ forms. The others have identical monodentate ligands and are achiral.