Which of the following pairs are epimers? Take epimers as sugars of the same constitution that differ in configuration at exactly one stereocentre.

AD-glucose and D-mannose
BD-glucose and D-galactose
CD-glucose and L-glucose
DD-glucose and D-fructose

Answer: A, B

D-mannose is the C-2 epimer and D-galactose the C-4 epimer of D-glucose. D-glucose and L-glucose are enantiomers (all centres inverted), and D-fructose is a constitutional isomer (ketose).

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