Glucose and galactose are having identical configuration in all the positions except position

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Glucose and galactose are essentially stereoisomers of each other. They differ merely in the stereochemical configuration around exactly one carbon atom, which characterizes them technically as epimers.
Specifically, they differ fundamentally at the C-4 position. In glucose, the hydroxyl group at C-4 points to the right in an open-chain Fischer projection, whereas in galactose, the hydroxyl group at C-4 points definitively to the left.

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