Multiple Choice
Which of these statements is false?
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9. Carbohydrates
Reducing Sugars Tests
Multiple Choice
Which of the following would you predict to be the LEAST reactive in a Fehling's test for reducing sugars?
A
D-Glucose.
B
L-Glucose.
C
D-Mannose.
D
D-Ribose.
E
D-Fructose.
Verified step by step guidance1
Understand the Fehling's test: It is a chemical test used to differentiate between water-soluble carbohydrates and ketone functional groups, primarily to identify reducing sugars.
Identify reducing sugars: Reducing sugars are those that have a free aldehyde group or a free ketone group that can be oxidized. In the context of monosaccharides, this typically involves sugars with a free aldehyde group.
Analyze the given sugars: D-Glucose, L-Glucose, D-Mannose, and D-Ribose are all aldoses, meaning they have an aldehyde group that can participate in the Fehling's test.
Consider D-Fructose: D-Fructose is a ketose, which means it has a ketone group. Ketoses are generally less reactive in the Fehling's test compared to aldoses because they do not have a free aldehyde group.
Conclude the least reactive sugar: Since D-Fructose is a ketose and the others are aldoses, D-Fructose would be the least reactive in a Fehling's test for reducing sugars.
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