Which from following ligands has highest field strength?

Which from following ligands has highest field strength?
  1. $\mathrm{S}^{2-}$
  2. $OH^-$
  3. EDTA.
  4. en

Solution

Increasing order of ligand field strength is: $\begin{aligned} & \mathrm{I}^{-} \lt \mathrm{Br}^{-} \lt \mathrm{Cl}^{-} \lt \mathrm{S}^{2-} \lt \mathrm{F}^{-} \lt \mathrm{OH}^{-} \lt \mathrm{C}_2 \mathrm{O}_4^{2-} \\ & \lt \mathrm{H}_2 \mathrm{O} \lt \mathrm{NCS}^{-} \lt \mathrm{EDTA} \lt \mathrm{NH}_3 \lt \mathrm{en} \lt \mathrm{CN} \lt \mathrm{CO} \end{aligned}$

Asked in: MHT CET 2024 (03 May Shift 2)

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