The reference compound shown is the simplest ketose. Which of Structures A to D is a ketohexose?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B

A ketohexose has a ketone C=O at C-2 and six carbons. The ketone with six carbons is L-sorbose; the ketopentose is ribulose, while the other two structures are aldoses (an aldohexose and an aldopentose).

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