1.

List the reactions of glucose which cannot be explained by its open chain structure.

Answer»

The following reactions of glucose cannot be explained by its open chain structure.
(i) Despite having the aldehyde group glucose does not give 2, 4-DNP test, Schiffs test and it does not form the hydrogen sulphite addition product with NaHSO3 .
(ii) The pentacetate of glucose does not react with hydroxylamine indicating the absence of free —CHO group.
(iii) When D-glucose is treated with methanol in the presence of dry hydrogen chloride gas, it gives two isomeric mono methyl derivatives known as α-D glucoside and methyl β-D glucoside. These glucosides do not react with hydrogen cyanide or with hydroxylamine.


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