JEE MAIN - Chemistry (2019 - 9th January Morning Slot - No. 4)
The increasing order of pka of the following amino acids in aqueous solution is :
Gly, Asp, Lys, Arg
Gly, Asp, Lys, Arg
Asp < Gly < Arg < Lys
Gly < Asp < Arg < Lys
Asp < Gly < Lys < Arg
Arg < Lys < Gly < Asp
Explanation
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pKa = $$-$$ logKa
$$ \therefore $$ Acidic strength (Ka) $$ \propto $$ $${1 \over {pKa}}$$
$$ \therefore $$ Order of acidic strength :
Asp > Gly > LYs > Arg
$$ \therefore $$ Order of pKa is :
Asp < Gly < Lys < Arg.
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