JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Coordination Compounds

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

____

Answer: 4

Solution

Fehling's solution holds copper(II) bound by the tartrate ion supplied by Rochelle salt. In the resulting complex each tartrate attaches to the metal through four donor oxygen atoms, the two deprotonated hydroxyl oxygens together with the two carboxylate oxygens, so the ligand grips the copper at four points. The denticity of this tartrate ligand is therefore four.

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Integer answer

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