Question:

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

Updated On: Jul 7, 2022
  • $[Cr(en)_3]^{3+}$
  • $[CrCl_6]^{3-}$
  • $[Cr(NH_3)_6]^{3+}$
  • $[Cr(CN)_6]^{3-}$
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The Correct Option is B

Solution and Explanation

The coordination entity, for which crystal fieid spiitting is smaller, absorbs light of Io west frequency. Weaker the ligand fieid strength, smaller will be the crystal fieid splitting. The order of field strength of various ligands is as $\, \, \, \, \, \, \, \, \, \, \, \, \, \, CN > en > NH_3 > Cl$ Hence, $[CrCl_6 ]^{3-}$ due to the presence of $Cl^-$ ligand absorbs light of Iowest frequency.
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Concepts Used:

Coordination Compounds

A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.

Coordination entity:

A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.

Ligands:

A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.