NEET 2020 · ChemistryCrystal fieldPrevious Year Question

Which of the following is the correct order of increasing field strength of ligand to form coordination compound?

Answer: (C) $SCN X^{-} < F X^{-} < C X_{2} O X_{4} X^{2 -} < CN X^{-}$ . \textbf{Answer:} (C) $SCN X^{-} < F X^{-} < C X_{2} O X_{4} X^{2 -} < CN X^{-}$ \textbf{Solution:} The field strength of ligands follows the spectrochemical series.

A. $F X^{-} < SCN X^{-} < C X_{2} O X_{4} X^{2 -} < CN X^{-}$
B. $CN X^{-} < C X_{2} O X_{4} X^{2 -} < SCN X^{-} < F X^{-}$
C. $SCN X^{-} < F X^{-} < C X_{2} O X_{4} X^{2 -} < CN X^{-}$ ✓
D. $SCN X^{-} < F X^{-} < CN X^{-} < C X_{2} O X_{4} X^{2 -}$

Correct Answer

Solution & Explanation

\textbf{Answer:} (C) $SCN X^{-} < F X^{-} < C X_{2} O X_{4} X^{2 -} < CN X^{-}$ \textbf{Solution:} The field strength of ligands follows the spectrochemical series. For the species given, the increasing order of field strength (and hence increasing $Δ_{o}$ ) is: $SCN X^{-} < F X^{-} < C X_{2} O X_{4} X^{2 -} < CN X^{-}$ , with $CN X^{-}$ being the strongest-field ligand and the thiocyanate (S-bonded) the weakest of this set. This is option C.

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