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Question
Which of the following reactions of glucose can be explained only by its cyclic structure?
Options
Glucose forms pentaacetate
Glucose reacts with hydroxylamine to form an oxime
Pentaacetate of glucose does not react with hydroxylamine
Glucose is oxidised by nitric acid to gluconic acid
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Solution
Pentaacetate of glucose does not react with hydroxylamine
Explanation:
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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\[\begin{array}{cc}
\ce{CHO}\\
|\phantom{....}\\
\phantom{..}\ce{(CHOH)4}\\
|\phantom{....}\\
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\end{array}\]
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