JEE Main 2019ChemistryBiomoleculesEasyMCQ

JEE Main 2019 — Biomolecules Question with Solution

JEE Main 2019 (10 Jan Shift 2)

Question

Which of the following tests cannot be used for identifying amino acids?

Choose an option

Show full solutionCorrect option: C
Correct answer
CBarfoed test

Step-by-step explanation

Barfoed’s test is used for distinguishing monosaccharides from reducing disaccharides. Monosaccharides usually react in about 1-2 minute while the reducing disaccharides take much longer time between 7-12 minutes to react with the reagent. Brick red color is obtained in this test which is due to formation of cuprous oxide

Barfoed's test is basically used for detecting the presence of monosaccharides.

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.