Five- and six-membered ring structures are common in carbohydrates and are often

Question

Five- and six-membered ring structures are common in carbohydrates and are often in equilibrium with each other. The five-membered ring structures are called furanose forms; the six-membered ring structures are pyranose forms. D-Ribose. especially in its beta-furanose form, is a familiar carbohydrate. What is the orientation of the OH groups at C-2 and C-3 in the beta-pyranose fonn of D-ribose? Both are equatorial. C-2 is equatorial: C-3 is axial. C-2 is axial: C-3 is equatorial. Both are axial.

Explanation / Answer

B. is correct.

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