JEE Main 2023 — Alcohols Phenols and Ethers Question with Solution
JEE Main 2023 (11 Apr Shift 2)
Question
Number of compounds from the following which will not produce orange red precipitate with Benedict solution is........
Glucose, maltose, sucrose, ribose,-deoxyribose, amylose, lactose
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Show full solutionCorrect answer: 2
Step-by-step explanation
Except sucrose and amylose all others, give orange red precipitate with Benedict solution.
Sucrose is a non-reducing disaccharide composed of glucose and fructose. It does not have a free aldehyde or ketone group and, therefore, cannot undergo oxidation and reduce the Benedict's reagent. As a result, sucrose will not produce an orange-red precipitate with the Benedict's solution.
Amylose is a polysaccharide composed of multiple glucose units linked together. While glucose, a monosaccharide, is a reducing sugar, the glycosidic bonds in amylose prevent the free aldehyde or ketone group from being available for oxidation. As a result, amylose, as a part of starch, does not give a positive Benedict's test and will not produce an orange-red precipitate.
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This is a previous-year question from JEE Main 2023, covering the Alcohols Phenols and Ethers 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.