試題詳解

8. All of the following statements about cyclic sugars are true EXCEPT:
(A) The a-anomer has the -OH of the anomeric carbon positioned on the same side of the sugar ring from the -CH₂OH,
(B) The five and six membered rings are more frequently observed due to stability,
(C) In a chair conformation, the predominant form has the bulkiest substituents occupying equatorial positions,
(D) The carbonyl carbon becomes a chiral center,
(E) They can be formed by the intramolecular reactions to hemiacetals or hemiketals.