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Question
Which of the following statements is not true about glucose?
Options
It is an aldohexose.
On heating with HI, it forms n-hexane.
It is present in pyranose form.
It gives 2, 4 DNP test.
Solution
It gives 2, 4 DNP test.
Explanation:
Because glucose lacks an open chain structure, it lacks a free –CHO group. Actually, the –CHO group interacts with C5–OH to produce a six-membered oxide ring known as a hemiacetal ring. As a result, because glucose resides primarily (99%) in the cyclic hemiacetal form, it does not pass the 2, 4-DNP test.
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