Multiple choice

Which of the following statements is not true about glucose?

  1. It is an aldohexose.

  2. It is present in furanose form.

  3. On heating with HI, it forms n-hexane.

  4. It does not give 2,4-DNP test.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In solutions, the open-chain form of glucose (either D- or L-) exists in equilibrium with several cyclic isomers, each containing a ring of carbons closed by one oxygen atom. In aqueous solution, however, glucose exists as pyranose for more than 99%. The open-chain form is limited to about 0.25% and furanose exists in negligible amounts.

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