Question:

Which of the following species is not expected to be a ligand?

Updated On: Jul 7, 2022
  • $NO$
  • $NH^{+}_{4}$
  • $NH_{2}CH_{2}CH_{2}NH_{2}$
  • $CO$
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The Correct Option is B

Solution and Explanation

Complexes are formed when ligands donate a pair of electrons to metals. In ammonia, $N$ atom has one lone pair of electrons. Nitrogen donates this lone pair of electrons to proton to form ammonium ion. So $N H _{4}^{+}$ ion does not have a lone pair of electrons which it can donate to central metal ion. Hence it cannot behave as a ligand.
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Notes on coordination compounds

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.