JEE Main 2019 — Biomolecules Question with Solution
JEE Main 2019 (12 Jan Shift 2)
Question
The correct structure of histidine in a strongly acidic solution is
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
In the acidic medium, only basic nitrogen is protonated. The second nitrogen is less basic because the lone pair is involved in aromaticity, while and are more basic.
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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.