1.

The octahedral complex of a metal ion M^(3+)with four monodentate ligands L_(1), L_(2), L_(3) and L_(4) absorb wavelengthin the region of red, green, yellow and blue respectively. The increasing order of ligand strengths of the four ligands is :

Answer»

`L_(4) lt L_(3) lt L_(2) lt L_(1)`
`L_(1) lt L_(3) lt L_(2) lt L_(4)`
`L_(3) lt L_(2) lt L_(4) lt L_(1)`
`L_(1) lt L_(2) lt L_(4) lt L_(3)`

Solution :The ENERGY increases in the order (VIBGYOR)
RED < yellow < green < BLUE
The complex absorbing LOWER energy will be of lower strength of ligand and therefore, the correct order of ligand strength is
`L_(1) lt L_(3) lt L_(2) lt L_(4)`


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