The denticity of the ligand present in the Fehling's reagent is ______.

Find the denticity of the ligand present in Fehling's reagent.

Identify the components of Fehling's reagent.

Fehling's reagent is a mixture of:

Fehling's solution A: Aqueous CuSO$$_4$$

Fehling's solution B: Alkaline sodium potassium tartrate (Rochelle salt, NaKC$$_4$$H$$_4$$O$$_6$$)

The ligand in Fehling's reagent is the tartrate ion ($$\text{C}_4\text{H}_4\text{O}_6^{2-}$$), which is 2,3-dihydroxybutanedioate.

Determine the denticity.

The tartrate ion coordinates to Cu$$^{2+}$$ through its donor atoms. In Fehling's reagent, tartrate acts as a bidentate ligand, coordinating through two oxygen atoms (one from a hydroxyl group and one from a carboxylate group).

Denticity = 2.

The correct answer is 2.