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In the spectrochemical series, which ligand is the STRONGEST field?
AIodide (I⁻), weakest
BWater (H2O), moderate
CFluoride (F⁻), weak
DCarbon monoxide (CO)
Answer & Solution
Correct answer: D. Carbon monoxide (CO)
Spectrochemical series (weak to strong): I⁻ < Br⁻ < Cl⁻ < F⁻ < H2O < NH3 < en < NO2⁻ < CN⁻ < CO. CO and CN⁻ are the strongest field ligands (cause low spin).
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