The reagents with which glucose does not react to give the corresponding tests/products are
A. Tollen’s reagent
B. Schiff’s reagent
C. HCN
D. NH2OH
E. NaHSO3
Choose the correct options from the given below:
Correct Answer :
B and E
Solution :
The correct option is B and E.
Explanation:
Although glucose contains an aldehyde group (-CHO) in its open-chain structure, it exists predominantly in cyclic hemiacetal forms (α and β-pyranose forms) in solution. The open-chain form is present in a very small amount (less than 1%).
Due to the stability of this cyclic structure, glucose does not undergo certain typical addition reactions of aldehydes:
1. Schiff's reagent (B): Glucose does not react with Schiff's reagent to give the characteristic pink/magenta test.
2. Sodium bisulfite (NaHSO3) (E): Glucose does not form a bisulfite addition product with NaHSO3.
However, glucose does react with:
- Tollen's reagent (A): To form a silver mirror, because the reagent is basic and shifts the cyclic-open chain equilibrium to continuously generate the open-chain form.
- HCN (C): To form a cyanohydrin addition product.
- NH2OH (D): To form an oxime.
Therefore, the reagents with which glucose does not react to give the corresponding tests/products are Schiff's reagent (B) and NaHSO3 (E).
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