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B
an aldohexose
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C
an α-furanose
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D
a ketopentose
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Solution
The correct option is B a ketohexose It is a β-furanose, hence, a ketohexose.
A ketohexose is a ketone-containing hexose (a six-carbon monosaccharide). The most common ketohexoses, each of which represents a pair of enantiomers (D- and L-isomers), include psicose, fructose, sorbose, and tagatose.