Question

Which of the following ligands form a chelate?
a.) Acetate
b.) Oxalate
c.) Cyanide
d.) Ammonia

Answer 1

Hint: Chelate is a type of coordinate class or composite compound that contains a central metal atom in the cyclic or ring structure connected to a large molecule called a ligand. A ligand is a reactive ion or molecule in the field of coordination chemistry, which attaches to a central metal atom in order to create a coordinating network.

Complete step-by-step answer:
In addition, the bond with metal involves a structured donation of one or more electron pairs of the ligand. The characteristics of the metal binding that differ from ionic to covalent. In fact, the bond order for metal ligands will range between 1 and 3. Ligands are classified as Lewis bases, while Lewis acidic "ligands" are uncommon cases known to occur.
In chelation the 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 amount with ring openings in the metal molecule, the more stable is the compound. The most stable is Chelates. This mechanism is called the chelate effect; the thermodynamic quantity called entropy, correlated with chelation, normally decreases. Chelates 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.
Oxalate is a bidentate ligand, and it shapes a chelate. This may be coordinated with all the O atoms.
The monodentate ligands are acetate, cyanide and ammonia. They never form chelates.
Hence, option B is the correct option.

Note: Chelation is effective in applications such as the production of dietary foods, chelation therapy for the removal of radioactive metals, the manufacture of homogeneous catalysts, acidic water treatment for the removal of metals and fertile compounds, and for contrast agents in MRI scan.