JEE Main 2019 — Biomolecules Question with Solution
From: JEE Main 2019 (Online) 9th January Morning Slot
Question
The increasing order of pka of the following amino acids in aqueous solution is :
Gly, Asp, Lys, Arg
Gly, Asp, Lys, Arg
Choose an option
Show full solutionCorrect option: C
Correct answer
CAsp < Gly < Lys < Arg
Step-by-step explanation
pKa = logKa
Acidic strength (Ka)
Order of acidic strength :
Asp > Gly > LYs > Arg
Order of pKa is :
Asp < Gly < Lys < Arg.
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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.