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JEE Main Chemistry question

ChemistryBiomoleculesJEE Main

Those stereoisomers which differ in configuration at only one chiral carbon atom are called 'epimers'. How many of the following are epimers of D-(+)-glucose? (four Fischer structures shown for comparison)

Answer: 2

Solution

Checking each of the four given structures against D-glucose, two of them differ from D-glucose's configuration at exactly one stereocentre (qualifying as genuine epimers — for example D-mannose at C2

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Question ID VK-151287