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α-D glucose and β-D glucose are the isomers which differ in the orientation (configuration) of H and OH groups around C1 atom.

1. α-D glucose
2. β-D glucose
3. α-D fructose
4. β-D fructose

Correct answer: α-D glucose

Solution

α-D glucose and β-D glucose are anomers, differing in the configuration of the hydroxyl group at the anomeric carbon (C1). The question specifically refers to α-D glucose.

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