According to the spectrochemical series, which is the strongest field ligand:

C N^{-}

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N O_{2}^{-}

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N H_{3}

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e t h a n e 1, 2 - d i a m i n e (e n)

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Solution

The correct option is A $C N^{-}$
Increasing order of strength of ligands
$I^{-} < B r^{-} < S^{2 -} < S C N^{-} < C l^{-} < N_{3}^{-} < E t_{2} O^{-} < F^{-} < O H^{-} < E t O H < O X^{2 -} < H_{2} O < N C S^{-} < E D T A < P y \approx N H_{3} < e n < B i P y \approx O - p h e n <$

$N O_{2}^{-} < C N^{-} < C O < N + O$
Hence, strongest legand is $C N^{-}$
Therefore, the correct option is (a).

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