Tollens' reagent (ammoniacal silver nitrate solution) is used to distinguish aldehydes from ketones. What is the observable positive result?
Answer and explanation
Correct answer: B. Formation of a shining silver mirror on the tube walls
- Step 1: Tollens' reagent contains the diamminesilver(I) complex ion, .
- Step 2: Aldehydes readily oxidize to carboxylate ions while reducing to metallic silver, depositing a shining silver mirror on clean glass walls.
Answer
Formation of a shining silver mirror on the tube walls.
Why not the others: Bright red precipitate corresponds to Fehling's test (); brown fumes indicate nitrogen dioxide evolution; and orange decolorization corresponds to bromine water.
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