Chemistry - Biomolecules Question with Solution | TestHub

Reaction of glucose with hydroxylamine (${\mathrm{NH}}_2\mathrm{OH}$) forms an oxime, which confirms the presence of a carbonyl group but does not distinguish between an aldehyde and a ketone.

Reaction of glucose with bromine water, a mild oxidizing agent, yields gluconic acid. Since bromine water oxidizes aldehydes but not ketones, this reaction specifically confirms the presence of an aldehydic group in glucose.

Oxidation with dilute ${\mathrm{HNO}}_3$ yields saccharic acid, confirming the presence of a primary alcoholic group.

Acetylation with acetic anhydride yields glucose pentaacetate, confirming the presence of five hydroxyl groups.

Answer: Formation of gluconic acid when reacted with ${\mathrm{Br}}_2$ water.