Question

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

Answer 1

Correct Answer - D
`overset (VIBGYOR) underset ("decreasing energy") rarr` `L_(1)(R) lt L_(3) (Y) lt L_(2) (G) lt L_(4) (B)`
Strong field ligand cause higher magnirtude of crystal field splitting which results in absorption of higher energy radiation `(Delta E alpha (1)/(lambda))`.