Write any two reactions of glucose which cannot be explained by the open chain structure of glucose molecule.

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Solution

Despite having the aldehyde group, glucose does not give Schiff’s test and it does not form the hydrogen-sulfite addition product with $N a H S O_{3}$ .
The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free $— C H O$ group.

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Write the reactions of D-glucose which can't be explained by its open chain structure. How can cyclic structure of glucose explain these reactions?

QUESTION 14.10

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

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