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_(4) lt L_(3),L_(2)lt L_(1)`
B. `L_(1)ltL_(3)lt L_(2)lt L_(4)`
C. `L_(3)lt L_(2)lt L_(4)ltL_(1)`
D. `L_(1) lt L_(2)lt L_(4)lt L_(3)`

Answer

B

Explanation

Ligand field strength `prop ` Energy of light absorbed
`prop=(1)/("Wavelength of light absorbed")`
wavelength of absorbed light decreases

As the energy of wavelength absorbed increases
extent of crystal - field splitting becomes greater , hence higher field strength of the ligand .
increasing order of energy
` underset( ("Red"))L_(1) lt underset(("Yellow"))L_(3)lt underset("(Green)")L_(2) lt underset("(Blue)")L_(4)`
Ligand field strength
` L_(1) lt L_(3) lt L_(2) lt L_(4) `