Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

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

Gly, Asp, Lys, Arg

  1. A

    Asp < Gly < Arg < Lys

  2. B

    Arg < Lys < Gly < Asp

  3. C

    Gly < Asp < Arg < Lys

  4. D

    Asp < Gly < Lys < Arg

Solution

Aspartic acid is acidic, glycine is neutral and lysine & arginine are basic -amino acids with arginine being more basic due to stronger basic functional group.

Their pKa value is directly proportional to basic strength, i.e., Arg > Lys > Gly > Asp. 

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