MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsPrevious Year Questions

Which of the following coordination entities should be expected to absorb light of lowest frequency?[AIIMS2009]

A.[Cr(en)3]

B.[CrCl6]✓ Correct

C.[Cr(NH3)6]

D.[Cr(CN)6]

Explanation

Strong field ligands absorb more energy Hence, they absorb more frequency. In the question the ligands 3 en,NH ,CN are strong field ligands Hence, they will absorb more energy and light of greater frequency. Therefore, the correct option is b as Cl is a weak field ligand. Hence, the correct option is (b).

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