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

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Strategy:
 Identify the active complexing agent in Fehling's solution.

Step 1: Analyze Fehling's reagent
Fehling's reagent is a mixture of copper(II) sulfate (Fehling A) and sodium potassium tartrate (Rochelle salt) in NaOH (Fehling B).
The active ligand is the tartrate ion ().

Step 2: Determine denticity
In the highly alkaline medium, the tartrate ion coordinates to the copper atom using two carboxylate oxygen atoms and two alkoxide (deprotonated hydroxyl) oxygen atoms.
This makes it a tetrad

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