Single Choice

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:

A$$ L_{3}< L_{2}< L_{4}< L_{1}$$
B$$ L_{1}< L_{2}< L_{4}< L_{3}$$
C$$ L_{4}< L_{3}< L_{2}< L_{1}$$
D$$ L_{1}< L_{3}< L_{2}< L_{4}$$
Correct Answer

Solution

Ligand field strength is directly proportional to the energy of light absorbed and inversely proportional to the wavelength of light absorbed.

The wavelength of absorbed light decreases with an increase in ligand field strength.

Therefore increasing order of energy of wavelength absorbed reflects a greater extent of crystal field splitting, hence increases the strength of ligand.

Hence, increasing order of ligand strength of the four ligand is :

Blue(L4)>Green(L2)>Yellow(L3)>Red(L1)

Thus option D is the correct answer.

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