Verified Solution • 2025–26 Session moderate

QJEEM19Ch9846: JEE Main 2019 Chemistry - Class 12 JEEM19Ch9846 Solution: The increasing order of pka of the following amino acids in…

The increasing order of pka of the following amino acids in aqueous solution is :

Gly, Asp, Lys, Arg

Multiple Choice Options

  • A Asp < Gly < Arg < Lys
  • B Gly < Asp < Arg < Lys
  • C Asp < Gly < Lys < Arg
  • D Arg < Lys < Gly < Asp

Step-by-Step Verified Solution

JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Biomolecules Question 141 English Explanation 1
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Biomolecules Question 141 English Explanation 2
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Biomolecules Question 141 English Explanation 3
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Biomolecules Question 141 English Explanation 4
pKa = −- logKa

∴\therefore    Acidic strength (Ka) ∝\propto 1pKa{1 \over {pKa}}

∴\therefore    Order of acidic strength :

Asp > Gly > LYs > Arg

∴\therefore    Order of pKa is :

Asp < Gly < Lys < Arg.

Related Learning Resources & Exam Preparation