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ChemistryNEET 2024Carbohydrates

Biomolecules

The reagents with which glucose does not react to give the corresponding tests/products are:

A. Tollens' reagent

B. Schiff's reagent

C. HCN

D. NH2OH\mathrm{NH_2OH}

E. NaHSO3\mathrm{NaHSO_3}

Choose the correct option from those given below:

  1. A.A and D
  2. B.B and E✓
  3. C.E and D
  4. D.B and C

Solution

Glucose has an aldehyde group, so it reduces Tollens' reagent and adds HCN and NH₂OH. It does not give the Schiff's test and does not form a bisulphite adduct with NaHSO₃ — anomalies explained by its cyclic hemiacetal structure. So B and E.

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