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Question

The reaction of glucose with acetic anhydride confirms the presence of how many hydroxy groups in glucose?

A
3
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B
4
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C
5
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D
6
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Solution

The correct option is C 5
The reaction of glucose with (CH3CO)2O gives glucose pentaacetate, which has five acetyl group in the structure. This reaction also proves that all the 5 OH groups are present at different carbon atoms, because of the stable nature of glucose.
Hence, (c) is correct.

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