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Biomolecules — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules2 Marks
Question
Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.
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Answer

The following reaction of glucose cannot be explained by its open chain structure :
(i) Despite the presence of aldehyde group, glucose does not give 2, 4-DNP test and Schiff's test. It does not form the hydrogen sulphite addition product with $NaHSO _3$.
(ii) Glucose penta acetate does not react with hydroxylamine indicating the absence of free - CHO group.
(iii) Glucose is found in two different crystalline forms which are named as $\alpha$ and $\beta$ glucose.

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