allerySpectrochemical series (ligand strength): which is a STRONG-field ligand?
ACl⁻
BI⁻
CH2O
DCN⁻
Answer & Solution
Correct answer: D. CN⁻
**Approximate order:** I⁻ < Br⁻ < Cl⁻ < F⁻ < OH⁻ < H2O < NH3 < en < NO2⁻ < CN⁻ < CO.
CN⁻ is among the strongest.
Strong-field ligands cause large d-orbital splitting and often low-spin complexes.
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