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Three octahedral complex ions are given: [M(en)3]³+ (I), [M(CN)6]³- (II), and [M(H2O)6]²+ (III), where en = ethylenediamine. Which of the following statements is correct?

1. The crystal field splitting order is Delta₀(I) > Delta₀(II) > Delta₀(III)
2. The order of wavelength of maximum absorption is lambda(III) > lambda(II) > lambda(I)
3. All three complexes exhibit optical isomerism
4. None of the three complexes exhibits geometrical isomerism

Correct answer: None of the three complexes exhibits geometrical isomerism

Solution

Each complex has either identical ligands (II, III) or only one type of bidentate ligand (I), so no geometric isomerism exists for any of them. Complexes II and III (MA6 type) also lack optical isomerism; only [M(en)3]³+ is optically active, so 'all three' are optically active is false.

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