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  4. Which of the following reactions of glucose can be explained only by its cyclic structure?

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Q. Which of the following reactions of glucose can be explained only by its cyclic structure?

NTA AbhyasNTA Abhyas 2022

Solution:

Hydroxyl amine particularly reacts with free carbonyl group to form oxime. In case of glucose there is no response to hydroxyl amine. This conforms that glucose carbonyl part forms an acetal in cyclic form.
In other cases like forming of pentaacetate and its oxidation to gluconic acid there is no confirmation of cyclic structure.