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Introduction to CFT

Which of the ...

Question

Which of the following is the correct arrangement of ligands in terms of field strength?

C l^{-} < F^{-} < N C S^{-} < N H_{3} < C N^{-}

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N H_{3} < F^{-} < C l^{-} < N C S^{-} < C N^{-}

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C l^{-} < F^{-} < N C S^{-} < C N^{-} < N H_{3}

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N H_{3} < C N^{-} < N C S^{-} < C l^{-} < F^{-}

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Solution

The correct option is A $C l^{-} < F^{-} < N C S^{-} < N H_{3} < C N^{-}$
Following is the order of strength of ligands:
$I^{-} < B r^{-} < S^{- 2} < S C N^{-} < C l^{-} < N O_{3}^{-}, F^{-} < O H^{-} < E t O H < o x < H_{2} O < N C S^{-} < P y, N H_{3}$
$< e n < b p y, p h < N O_{2}^{-} < C_{6} H_{5}^{-} < C N^{-} < C O$ .

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