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

The denticity of the ligand present in the Fehling's reagent is 2.

Here's the step-by-step explanation:

1. Fehling's reagent is a solution of copper(II) complex. The copper(II) ion is coordinated to four molecules of water and two molecules of tartrate ion in a square planar geometry.

2. The tartrate ion acts as a ligand, a molecule that donates a pair of electrons to a central metal atom or ion.

3. Denticity refers to the number of donor groups in a single ligand that binds to a central atom in a coordination complex.

4. In the case of the tartrate ion in Fehling's reagent, it binds to the copper(II) ion through two oxygen atoms. Therefore, the denticity of the tartrate ion is 2.