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Chemistry Question on coordination compounds

Homoleptic octahedral complexes of a metal ion 'M3+{M^{3+} }' with three monodentate ligands and L1,L2,L3L_1, L_2, L_3 absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is :

A

L2<L1<L3L_2 < L_1 < L_3

B

L3<L2<L1L_3 < L_2 < L_1

C

L3<L1<L2L_3 < L_1 < L_2

D

L1<L2<L3L_1 < L_2 < L_3

Answer

L3<L1<L2L_3 < L_1 < L_2

Explanation

Solution

Order of λabs−L3>L1>L2\lambda_{abs} - L_{3 } > L_{1} > L_{2}
So ΔO\Delta_{O} order will be L2>L1>L3(asΔO∝1λabs) L_{2} > L_{1} >L_{3} \left( \text{as} \Delta_{O} \propto \frac{1}{\lambda_{abs }} \right)
So order of ligand strength will be L2>L1>L3 L_{2} > L_{1} >L_{3}