The octahedral complex of a metal ion `M^(3+)` with four monodentate ligands `L_(1),L_(2),L_(3)` and `L_(4)` absorb wavelengths in the region of red,green, yellow and bule, respectively The increasing order of ligand strengh of the four ligands is

Options

A. `L_(1)ltL_(2)ltL_(4)ltL_(3)`
B. `L_(4)ltL_(3)ltL_(2)ltL_(1)`
C. `L_(1)ltL_(3)ltL_(2)ltL_(4)`
D. `L_(3)ltL_(2)ltL_(4)ltL_(1)`

Answer

C

Explanation

`overset("V I B G Y O R")underset("Wavelength"(lambda)"increases")rarr`
According to spectrochemical series, greater the adsorption frequency, stronger is the ligand
or CFSE `(Delta_(0)) prop` Strength of ligand `prop` Frequency absorbed (v) or `prop (1)/(lambda)`
Hence, increasing order of ligand strength will be
`underset(("Red"))(L_(1))ltunderset(("Yellow"))(L_(3))ltunderset(("Green"))(L_(2))ltunderset(("Blue"))(L_(4))`