Co-Ordination Compounds Question 160
Question: The octahedral complex of a metal ion $ {M^{3+}} $ with fan monodentate ligands $ L_1, $ $ L_2, $ $ L_3, $ and $ L_4, $ absorbs wavelength! in the region of red, green, yellow, and blue, respectively The increasing order of ligand strength of the four Uganda is:
Options:
A) $ L_4<L_3<L_2<L_1 $
B) $ L_1<L_3<L_2<L_4 $
C) $ L_3<L_2<L_4<L_1 $
D) $ L_1<L_2<L_4<L_3 $
Show Answer
Answer:
Correct Answer: B
Solution:
Ligand $ L_1 $
$ L_2 $
$ L_3 $
$ L_4 $ Coloured region of absorbed wavelength Red Green Yellow Blue Coloured regions of visible light (VIBGYOR) are arranged in the increasing order of wavelength or decreasing order of energy $ [E\infty 1/\lambda ] $ .
Therefore, This suggests that $ L_4 $ will absorb higher energy wavelength followed by $ L_2 $ , $ L_3 $ , and $ L_1 $ .
Since higher absorbed energy corresponds to greater extent of crystal field splitting and, thus, higer field strength of the ligand.
Hence, the increasing order of ligand strength of the four ligands is $ L_1<L_3<L_2<L_4 $
