NEET 2024 · ChemistryGlucose structurePrevious Year Question
The reagents with which glucose does NOT react to give the corresponding test/product are: A. Tollen's reagent B. Schiff's reagent C. D. E. Choose the correct option from those given below:
Answer: (B) B and E. \textbf{Answer:} (B) Glucose does not respond to Schiff's reagent (B) nor form the bisulphite adduct with (E).
- A.A and D
- B.B and E✓
- C.E and D
- D.B and C
Correct Answer
(B) B and E
Solution & Explanation
\textbf{Answer:} (B) Glucose does not respond to Schiff's reagent (B) nor form the bisulphite adduct with (E). \textbf{Solution:} In solution, glucose exists predominantly in the cyclic hemiacetal (pyranose) form, so a truly free group is largely unavailable. The Schiff's test and addition both require a free aldehyde, hence both are negative for glucose. By contrast, Tollen's reagent (oxidation to mirror), (cyanohydrin) and (oxime formation) react via the small equilibrium amount of open-chain form. Therefore the non-reacting reagents are B and E, giving option B.
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