# Which of the following species is not expected to be a ligand?Option 1)  NOOption 2)  Option 3)  $NH_2CH_2CH_2NH_2$Option 4) CO

Ions and molecules that bond to the central atom in the coordination sphere are called Ligands.

NH+does not have an electron pair to form a coordinate bond with, so it can't act as a ligand.

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