Fundamentholfundamenthol
NEET2024Chemistry
Q.

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. NHOH E. NaHSO

Choose the correct options from the given below:

  1. A

    B and E

  2. B

    E and D

  3. C

    B and C

  4. D

    A and D

Solution

Glucose exists predominantly in the cyclic hemiacetal form with very little free -CHO present at any moment. Schiff's test and NaHSO addition need a free aldehyde and so are negative for glucose.

Glucose does respond to Tollens' (silver mirror), HCN (cyanohydrin), and NHOH (oxime), because these go through the small but reactive open-chain aldehyde.

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