JEE Advanced 2026 Chemistry question

The correct statement(s) regarding sugars is(are)

Given: Specific rotations of L-()-glucose and L-()-fructose are and , respectively.

(A)On treatment with HNO, gluconic acid is oxidized to saccharic acid, whereas glucose is not oxidized to saccharic acid.
(B)Fructose gives a positive Fehling's test because it isomerises to glucose and another aldohexose in the presence of Fehling's reagent.Correct
(C)Invert sugar is an equimolar mixture of D-glucose and D-fructose formed after hydrolysis of the corresponding disaccharide.Correct
(D)Specific rotation of invert sugar is .

Answer: (B),(C)

Solution

**(A)** Nitric acid is a strong oxidising agent that oxidises **both** ends of an aldose: glucose **saccharic (glucaric) acid**. The statement denies exactly this well-known reaction. FALSE. **(B)** Fehling's (and Tollen's) reagents are alkaline. In base, the ketose fructose undergoes

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Question ID VK-104797