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Electronic Configuration

Homoleptic oc...

Question

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

A

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

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B

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

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C

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

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D

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

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Solution

The correct option is A $L_{3} < L_{1} < L_{2}$
Order of $λ_{a b s} - L_{3} > L_{1} > L_{2}$

So $Δ_{o}$ order will be $L_{2} > L_{1} > L_{3}$ (as $Δ_{o} \infty \frac{1}{λ_{a b s}}$ )

So order of ligand strength will be $L_{2} > L_{1} > L_{3}$

Hence, the correct option is $A$

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