Question:
The stability of complexes of $ C{{u}^{2+}},\,\,N{{i}^{2+}},\,\,C{{o}^{2+}} $ and $ F{{e}^{2+}} $ varies in the order:
The stability of complexes of $ C{{u}^{2+}},\,\,N{{i}^{2+}},\,\,C{{o}^{2+}} $ and $ F{{e}^{2+}} $ varies in the order:
Updated On: Aug 1, 2022
- $C{{u}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}}>F{{e}^{2+}} $
- $C{{u}^{2+}}>F{{e}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}} $
- $N{{i}^{2+}}>C{{o}^{2+}}>F{{e}^{2+}}>C{{u}^{2+}} $
- $C{{u}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}}>F{{e}^{2+}} $
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The Correct Option is D
Solution and Explanation
When cations have some charge but number of $ d- $ electrons are different then the stability (or CFSE) decrease with increase in the number of $ d- $ electrons. Therefore, the correct order is:
$F{{e}^{2+}}>C{{o}^{2+}}>N{{i}^{2+}}>C{{u}^{2+}} $
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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.