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JEE Main levelSingle correct optionDifficulty 2 of 3df132

The very pale pink colour of (high spin ) is explained by the fact that its d-d transitions:

  1. Aoccur from the filled to the empty set of orbitals with no spin change
  2. Brequire a change of electron spin, so they are spin-forbidden and very weak
  3. Care absent since Mn(II) has a configuration
  4. Dare allowed and intense because the complex is octahedral

Answer: B

In high-spin (one electron in each of five orbitals, all parallel) any d-d excitation must put the electron into an orbital with an antiparallel arrangement, a spin-flip. Such transitions are spin-forbidden, so absorption is very weak.
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