MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic 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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