Question
Download Solution PDFOxidation of Tollen’s reagent is done by which of the following?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
Tollens’ Reagent and Its Oxidation
- Tollens’ reagent is an ammoniacal silver nitrate solution, commonly used as a chemical test to identify aldehydes.
- It contains the diamminesilver(I) complex, [Ag(NH3)2]+, which acts as an oxidizing agent.
- Aldehydes reduce the silver(I) ion in Tollens’ reagent to metallic silver (Ag), while being oxidized to carboxylic acids.
EXPLANATION:
- Cellulose: Does not have a free aldehyde group and cannot reduce Tollens’ reagent.
- Glucose: Contains a free aldehyde group in its open-chain form and can reduce Tollens’ reagent by oxidizing itself to gluconic acid.
- Sucrose: A non-reducing sugar as it lacks a free aldehyde group, so it cannot reduce Tollens’ reagent.
- Fructose: A ketohexose, but it can isomerize to glucose under the basic conditions of Tollens’ reagent, allowing it to reduce the reagent indirectly.
- Therefore, the oxidation of Tollens’ reagent is most directly and effectively achieved by glucose, which is a reducing sugar with a free aldehyde group.
Correct Answer: Option 2 (Glucose)
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