During the positive chemical indication of Benedict's test with an aliphatic aldehyde, the complexed — Aldehydes Ketones and Carboxylic Acids Chemistry Question

💡 Solution & Explanation

Benedict's reagent contains cupric ions ($Cu^{2+}$, Oxidation State = +2) complexed with citrate. When reduced by an aldehyde, it forms a red precipitate of cuprous oxide ($Cu_2O$). In $Cu_2O$, copper has an Oxidation State of +1. The change is from +2 to +1. Magnitude of change = $ | 2 - 1 | = 1$.