Glucose gives a positive silver mirror test with ammoniacal silver nitrate because it contains:

Step-by-step solution

Tollens' reagent is an ammoniacal silver nitrate solution, which acts as a mild oxidizing agent. It is used to distinguish aldehydes from ketones, as it oxidizes aldehydes to corresponding carboxylate ions and gets reduced to metallic silver, forming a silver mirror on the inner walls of the test tube. Glucose is an aldohexose, meaning its open-chain structure contains an aldehyde group ( -CHO ) at the C₁ position. Due to the presence of this aldehyde group, glucose readily reduces Tollens' reagent and gives a posi