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  4. The octahedral complex of a metal ion M3+ 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

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Q. 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 blue, respectively. The increasing order of ligand strength of the four ligands is

JEE MainJEE Main 2014Coordination Compounds

Solution:

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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

$L _{1}< L _{3}< L _{2}< L _{4}$