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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:

1. L4 < L3 < L2 < L1
2. L1 < L3 < L2 < L4
3. L3 < L2 < L4 < L1
4. L1 < L2 < L4 < L3

Correct answer: L1 < L3 < L2 < L4

Solution

Crystal-field splitting (and hence ligand strength) increases as the energy of absorbed light increases, i.e. as wavelength decreases. Wavelengths run red > yellow > green > blue, so field strength runs L4(blue) > L2(green) > L3(yellow) > L1(red). Increasing order of ligand strength: L1 < L3 < L2 < L4.

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