Question

D-glucose and D-galactose are :

• A. C-2 epimer
• B. C-3 epimer
• C. C-4 epimer
• D. C-1 epimer

Answer 1

The correct option is C C-4 epimer

When there is a change in configuration at only one chiral centre in a molecule, this pair is called as epimers. Remaining positions are same in the two molecules.
$C-1$ epimer is known as anomer.​
Trick: MAGI; for remembering epimers of glucose.
M-mannose; epimer at $C-2$
A-allose; epimer at $C-3$
G-galactose; epimer at $C-4$
I-Idose; epimer at $C-5$
Hence, (c) is correct.