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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:

1. L 1 < L 3 < L 2 < L 4
2. L 3 < L 2 < L 4 < L 1
3. L 1 < L 2 < L 4 < L 3
4. L 4 < L 3 < L 2 < L 1

Correct answer: L 1 < L 3 < L 2 < L 4

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