Chemistry - Biomolecules Question with Solution | TestHub

Reaction of glucose with hydroxylamine ($N{H}_{2}OH$) yields an oxime. This reaction is characteristic of aldehydes and ketones, thus confirming the presence of a carbonyl group in glucose.

Heating glucose with HI for a long time forms n-hexane, which confirms that all six carbon atoms are linked in a straight chain.

Reaction of glucose with excess acetic anhydride forms glucose pentaacetate, which confirms the presence of five hydroxyl ($-OH$) groups.

Oxidation of glucose with dilute nitric acid yields saccharic acid, which confirms the presence of a primary alcoholic group.

Answer: When glucose is heated with hydroxyl amine forms glucose oxime.