Among the ligands NH 3 , en, CN − and CO the correct order of their increasing field strength, is :

Question

Among the ligands NH 3 ​ , en, CN − and CO the correct order of their increasing field strength, is :

TestHub · Accepted Answer

Ligands can be arranged in a series in the orders of increasing field strength as given below:
Weak field ligands:
$I^{-} < Br^{-} < S^{2 -} < SCN < Cl^{-} < N_{3}^{-}, F^{-}$ $<$ Urea, OH $<$ oxalate
Strong field ligands
$O^{--} < H_{2} O < NCS^{-} < EDTA < Py, NH_{3} <$ en $= SO_{3}^{-} <$ bipy, Phen $< NO_{2}^{-} < CH_{3}^{-}$ $< C_{6} H_{5}^{-} < CN^{-} < CO$
Such a series is termed as spectrochemical series. It is an experimentally determined series based on the absorption of light by complexes with different ligands.

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