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14.10     Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.

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Below are the few reactions which cannot be explained by the open structure of glucose:-    

1.  Even if glucose has an aldehyde group, it does not give Schiff’s test and as a result, it does not form the hydrogen sulphite addition product with NaHSO3.

2. The pentaacetate of glucose does not react with hydroxylamine, which indicates the absence of free —CHO group.

3. It is found that glucose exists in two different crystalline forms which are named as α and β. This property can only be explained by the cyclic structure of glucose.

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Devendra Khairwa

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