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JEE Main Chemistry question

ChemistryBiomoleculesJEE Main

How many of the following statements about D-fructose and L-fructose (straight-chain forms only) are correct? (i) They are enantiomers (ii) They are diastereomers (iii) They are anomers (iv) They are epimers (v) D-fructose is laevorotatory

Answer: 2

Solution

D-fructose and L-fructose are complete mirror images of each other (differing in configuration at every one of their three stereocentres, C3, C4 and C5), so they are enantiomers, not diastereomers — making statement (i) true and (ii) false. "Anomer" applies only to cyclic sugars differing at the anomeric carbon,

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Question ID VK-151236