A) Symbols D- and L-before the n me of monosaccharides refer to the direction of rotation of the light
B) Pyranose has a six-membered ring structure
C) Furanose has a five-membered ring structure
D) Pyranose and furanose are the examples of hemiketal.
Correct Answer: A
Solution :
Symbols d and l refer to the configurations and not to the direction of rotation. When the hydroxyl group, attached to the last asymmetric carbon farthest from the aldehydic or carbon group, is on the right the configuration is d and when the hydroxyl group is on the left, the configuration is L.
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