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GK QUESTION#3242

Why is the six membered cyclic structure of glucose called a pyranose structure?

  1. APyran is a non-cyclic organic compound, with one oxygen atom and five carbon atoms in the ring.
  2. BFuran is a five membered cyclic compound, with one oxygen and four carbon atoms.
  3. CPyran is a cyclic organic compound, with one oxygen atom and five carbon atoms in the ring.Correct answer
  4. DFuran is a five membered non-cyclic compound, with one oxygen and four carbon atoms.
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Answer

C. Pyran is a cyclic organic compound, with one oxygen atom and five carbon atoms in the ring.

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Explanation

The six-membered cyclic form of glucose is called a pyranose because its ring size and oxygen-containing skeleton resemble pyran: five carbon atoms and one oxygen atom in the ring. Furan has a five-membered ring. The glucose ring is saturated; the analogy does not make it chemically identical to pyran.

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