Which of the following ligands forms a chelate - Vidyadip

MCQ

Which of the following ligands forms a chelate

A
Acetate
B
Ammonia
C
Cyanide
✓
Oxalate

✓

Answer

Correct option: D.

Oxalate

d
In chelation, ring formation occurs because two atoms from the same ligand coordinate with the metal atom. This cannot happen if the ligand is monodentate. Oxalate is a bidentate ligand hence it forms a chelate. It can coordinate with both of its negatively charged $O$ atoms.

Acetate, cyanide and ammonia are monodentate ligands. They do not form chelates.

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