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In the spectrochemical series, ligands are arranged in order of their field strength. The correct order (weak → strong) is:
AF⁻ < I⁻ < Cl⁻ < CN⁻
BCO < CN⁻ < NH₃ < H₂O < F⁻
CCN⁻ < NH₃ < H₂O < Cl⁻ < I⁻
DI⁻ < Br⁻ < Cl⁻ < F⁻ < H₂O < NH₃ < en < CN⁻ < CO
Answer & Solution
Correct answer: D. I⁻ < Br⁻ < Cl⁻ < F⁻ < H₂O < NH₃ < en < CN⁻ < CO
**Spectrochemical series (weak → strong)**: I⁻ < Br⁻ < SCN⁻ < Cl⁻ < S²⁻ < F⁻ < OH⁻ < C₂O₄²⁻ < H₂O < NCS⁻ < EDTA⁴⁻ < NH₃ < en < CN⁻ < CO. CO and CN⁻ are at the strong-field end; halides are weak.
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