JEE Main 2019 — Biomolecules Question with Solution
From: JEE Main 2019 (Online) 8th April Evening Slot
Question
Fructose and glucose can be distinguished by :
Choose an option
Show full solutionCorrect option: C
Correct answer
CSeliwanoff's test
Step-by-step explanation
Seliwanoff's test is used to distinguish aldose
and ketose.
When Seliwanoff's reagent added to a solution containing ketoses, red colour is formed rapidly indicating a positive test.
While in case of aldose, a slower forming light pink colour observed.
When Seliwanoff's reagent added to a solution containing ketoses, red colour is formed rapidly indicating a positive test.
While in case of aldose, a slower forming light pink colour observed.
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Biomolecules chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2019, 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.