Which of the following ligands form a chelate?
- Acetate
- Oxalate
- Cyanide
- Ammonia
The Correct Option is B
Solution and Explanation
Oxalate is a bidentate ligand and hence it forms a chelate.
In chelation, ring forming is induced by the interaction of two atoms with the metal atom from the same ligand. This is unlikely if the ligand is monodentate. The more stable are Chelates than unchelated compounds with a similar structure, and the greater the number of ring openings in the metal molecule, the more stable the compound.
The most stable is Chelates. This mechanism is called the chelate effect. The thermodynamic quantity called entropy, correlated with chelation, normally decreases. Chelate's durability is often correlated with the number of chelate atoms. Chelates with five or six circles are typically more secure than those with four, seven, or eight circles.
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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.