BIOLOGY
STRUCTURE OF GLUCOSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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C-1
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C-2
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C-3
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C-4
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C-5
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Detailed explanation-1: -The six membered cyclic structure of glucose is called pyranose structure or form, in analogy with Pyran.
Detailed explanation-2: -Sugars such as glucose exist in equilibrium between their open-chain form and various cyclic forms where an OH group and an aldehyde combine to form a cyclic hemiacetal. In the case of glucose, a 5-or 6-membered ring can form, depending on which hydroxyl group adds to the aldehyde.
Detailed explanation-3: -Five and six-membered rings are favored over other ring sizes because of their low angle and eclipsing strain. Cyclic structures of this kind are termed furanose (five-membered) or pyranose (six-membered), reflecting the ring size relationship to the common heterocyclic compounds furan and pyran shown on the right.
Detailed explanation-4: -Rings with five and six atoms are called furanose and pyranose forms, respectively. Heterocyclic ring and the straight-chain forms exist in equilibrium.