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.

Answer 1

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.