Among the ligands


Among the ligands $\mathrm{NH}_{3}$, en, $\mathrm{CN}^{-}$and $\mathrm{CO}$ the correct order of their increasing field strength, is :-

  1. $\mathrm{CO}<\mathrm{NH}_{3}<\mathrm{en}<\mathrm{CN}^{-}$

  2. $\mathrm{NH}_{3}<$ en $<\mathrm{CN}^{-}<\mathrm{CO}$

  3. $\mathrm{CN}^{-}<\mathrm{NH}_{3}<\mathrm{CO}<$ en

  4. en $<\mathrm{CN}^{-}<\mathrm{NH}_{3}<\mathrm{CO}$

Correct Option: , 2


Solution not required

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