Question

Which one of the following is enriched with a non-reducing sugar?

• A. Grapes
• B. Germinating barley grains
• C. Table sugar
• D. Mother's milk

Answer 1

The correct option is C Table sugar

• Sucrose is known as table sugar.
• It is a disaccharide which is formed by the linkage of fructose and glucose.
• The anomeric carbons C${}_1$ of the glucose and C${}_2$ of fructose are linked by glycosidic bonds so they lack hemiacetal group nor a hemiketal group.
• Thus, they cannot be oxidized by a weak oxidizing agent. So, they are stable and are non-reducing sugar.
• So, the correct answer is option C.