Question

The number of donar sites in mercapto, glycinato, diethylene triamine and $(EDTA{)}^{4-}$ are: -

• A. 1 ,2, 3, 4
• B. 1, 2, 3, 6
• C. 1, 2, 4, 6
• D. 1, 2, 2, 6

Answer 1

Answer: (B)

Denticity refers to the number of donor groups in a single ligand that bind to a central atom in a coordination complex. In many cases, only one atom in the ligand binds to the metal, so the denticity equals one, and the ligand is said to be monodentate (sometimes called unidentate). Ligands with more than one bonded atom are called polydentate or multidentate.
$Mercapto\to H{S}^{-}$
$\text{Glycinato}\to \stackrel{\cdot \cdot }{N}{\text{H}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{COO}}^{-}$