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All amino acids have at least two pKa values. Which of the following functional groups would provide an amino acid a third pKa value (between 0 and 14)?
A) -CH2CH2CONH2
B) -C(OH)CH3
C) -CH2CH2SCH3
D) -CH2CH2CH2CH2NH2
The answer is choice D, but I don't get why.
A) -CH2CH2CONH2
B) -C(OH)CH3
C) -CH2CH2SCH3
D) -CH2CH2CH2CH2NH2
The answer is choice D, but I don't get why.