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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

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

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

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

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

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detailed solution

Correct option is C

The larger the ligand strength, larger the splitting of d orbitals. Hence, d-d transition has larger energy or lesser wavelength. Since the energy of absorbed light follows the order

Blue > Green > Yellow > Red

Thus, the ligand strength will follow the order

$L_{4} > L_{2} > L_{3} > L_{1}$ i.e. $L_{1} < L_{3} < L_{2} < L_{4}$ (Choice c)

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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