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Question

The octahedral complex of a metal ion M+3 with four monodentate ligands L1, L2, L3 and L4 absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is

Options

A.L4 < L3 < L2 < L1
B.L1 < L3 < L2 < L4
C.L3 < L2 < L4 < L1
D.L1 < L2 < L4 < L3

Solution

       
The energy of red light is less than that of violet light.
So energy order is
Red < Yellow < Green < Blue
The complex absorbs lower energy light lower will be its strength. So order of ligand strength is
L1 < L3 < L2 < L4

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