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

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Glucose vs Galactose — epimers at C4:

Both glucose and galactose are aldohexoses with molecular formula . They are epimers — diastereomers differing in configuration at only one chiral centre.

| Carbon | D-Glucose | D-Galactose |
|---|---|---|
| C2 | R (–OH on right in Fischer) | R (same) |
| C3 | S (–OH on left) | S (same) |
| C4 | R (–OH on right) | S (–OH on left) ← different |
| C5 | R | R (same) |

Glucose and galactose differ only at C4 — the –OH group is on the right in glucose (D-gluco

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