JEE Main 2024ChemistryBiomoleculesEasyMCQ

JEE Main 2024 — Biomolecules Question with Solution

JEE Main 2024 (30 Jan Shift 1)

Question

Sugar which does not give reddish brown precipitate with Fehling's reagent is:

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Show full solutionCorrect option: A
Correct answer
ASucrose

Step-by-step explanation

Sucrose does not give Fehling's test positive, and it does not have any aldehyde or ketone group free to undergo oxidation.

It is used to distinguish between aldehyde and ketone. Aldehydes are easily oxidized and give positive Fehling’s test. Ketones apart from alpha-hydroxy-ketones do not give positive Fehling’s test as they are not oxidized easily. Aldose monosaccharides and ketose monosaccharides both give positive Fehling’s test. Presence of glucose in urine can be determined using Fehling’s test.

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About this question

This is a previous-year question from JEE Main 2024, covering the Biomolecules chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.