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NEET CHEMISTRYBiomoleculesEasy

Question

A compound that gives a positive Fehling solution test is:

A

Sucrose

B

Glucose

C

Fats

D

Protein

Step-by-Step Solution

Fehling's solution test is used to detect the presence of reducing sugars. Carbohydrates that have a free aldehyde or ketone group (or a free hemiacetal/hemiketal group) act as reducing sugars. Glucose is an aldohexose and has a free hemiacetal group that can open up to form an aldehyde in solution, thus it readily reduces Fehling's solution (giving a red precipitate of Cu2O\text{Cu}_2\text{O}). Sucrose is a non-reducing sugar because both of its anomeric carbons are involved in the glycosidic linkage. Fats and proteins do not give a positive Fehling's test.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Biomolecules. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYBiomoleculescompoundpositivefehlingsolution

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