Why is d glucose dextrorotatory and d fructose levorotatory?
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Fructose is one of the sweetest of all sugars and is combined with glucoseto make sucrose, or common table sugar. An older common name forfructose is levulose, after itslevorotatory property of rotating plane polarized light to the left (in contrast toglucose which is dextrorotatory).
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This makes them constitutional isomers, because they have the same formula but a different order of bonding. Beyond this, we can say that they are both hexoses, but one is a ketohexose and the other is an aldohexose. Also, D-fructose is levorotatory, but D-glucose is dextrorotatory.
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