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Q.

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

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a

 Glucose forms pentaacetate

b

Glucose reacts with hydroxylamine to form an oxime

c

Pentaacetate of glucose does not react with hydroxylamine

d

Glucose is oxidised by nitric acid to gluconic acid

answer is C.

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Detailed Solution

Pentaacetate of glucose does not react with hydroxylamine
The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free -CHO group. This property of glucose can be explained only by its cyclic structure.

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