The octahedral complex of a metal ion $M^{3 +}$ with four monodentate ligands $L_{1}, L_{2}, L_{3} and L_{4}$ absorb wavelength in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is :

L_{3} < L_{2} < L_{4} < L_{1}

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L_{1} < L_{2} < L_{4} < L_{3}

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L_{4} < L_{3} < L_{2} < L_{1}

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L_{1} < L_{3} < L_{2} < L_{4}

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Solution

The correct option is D $L_{1} < L_{3} < L_{2} < L_{4}$
$Ligand Strength \propto Δ_{o} \propto \frac{h c}{λ}$
It means ligand strength or splitting energy is inversely proportional to wavelength.
$λ_{b l u e} < λ_{g r e e n} < λ_{y e l l o w} < λ_{r e d}$
Hence ligand strength is
$L_{1} < L_{3} < L_{2} < L_{4}$

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