JEE PYQ: Biomolecules And Polymers Question 52
Question 52 - 2019 (09 Jan Shift 1)
The increasing order of pKa of the following amino acids in aqueous solution is:
Gly, Asp, Lys, Arg
(1) Asp < Gly < Arg < Lys
(2) Gly < Asp < Arg < Lys
(3) Asp < Gly < Lys < Arg
(4) Arg < Lys < Gly < Asp
Show Answer
Answer: (3)
Solution
Aspartic acid is an acidic amino acid and glycine is a neutral amino acid while lysine and arginine are basic amino acids. Also, arginine is more basic due to the stronger basic functional groups. The order of pKa value is directly proportional to the basic strength of amino acids, i.e. Arg > Lys > Gly > Asp.
BETA
