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

Options

A. `L_1 lt L_2 lt L_4lt L_3`
B. `L_4 lt L_3 lt L_2 lt L_1`
C. `L_1 lt L_3 lt L_2 lt L_4`
D. `L_3 lt L_2 lt L_4 lt L_1`

Answer

C

Explanation

`underset("Wavelength" (lambda) " increases") overset("V I B G Y O R")larr`
According to spectochemical series, greater the adsorption frequency, stronger is the ligand
or CFSE `(Delta_0) prop` Strength of ligand `prop` Frequency absorbed (v) of `prop 1/lambda`
Hence, increasing order of ligand strength will be
`underset(("Red"))(L_1) lt underset(("Yellow")) L_3 lt underset(("Green"))L_2 lt underset(("Blue"))L_4`