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) lt L_(2) lt L_(4) lt 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) L_(1)`

Answer

C

Explanation

According to the spectrochemical series, more the absorption frequency, stronger is the ligand. Or `triangle` or CFSE `prop` strength of ligands
`prop (1)/(lambda)`
Hence the increasing order of ligand strength is
`L_(1) lt L_(3) gt lt L_(2) lt L_(4)`
(Red) (Yellow) (Green) (Blue)