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An octahedral complex formed by a metal ion M3+ with four different monodentate ligands L1, L2, L3 and L4 shows absorption in the red, green, yellow and blue regions, respectively. The correct increasing sequence of ligand field strength for these ligands is:

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

Correct answer: L1 < L3 < L2 < L4

Solution

The correct option indicates that as the ligand field strength increases, the absorption shifts from red (lower energy) to blue (higher energy), which corresponds to the order of ligands L1, L3, L2, and L4. This sequence reflects the increasing ability of the ligands to split the d-orbitals of the metal ion, thus affecting the energy of the absorbed light.

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