Which of the following pairs of compounds are epimers?
a. Glucose and mannose
b. Mannose and galactose
c. Glucose and galactose
d. Mannitol and sorbitol

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a and c but not b and d

a, b, c, and d

a and d but not b and c

a, c, and d but not b

answer is D.

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Detailed Solution

a. D-Glucose and D-mannose are C-2 epimers

b. Galactose is the C-4 epimer of glucose, whereas mannose is the C-2 epimer of glucose.

c. Glucose and galactose are epimeric at C-4

d. Sorbitol and mannitol are epimers. They differ in configuration only at C-1

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