Multiple choice

On the basis of this fact, what is the correct decreasing order of the pKa range of various dissociating groups?

The acid strengths of weak acids are expressed as their pKa. The net charge on an amino acid is the algebraic sum of all the positively and negatively charged groups present.

  1. Guanidinium of Arg > α - Amino > OH of Tyr > Imidazole of Histidine > α - Carboxyl

  2. Guanidinium of Arg > α - Amino > α - Carboxyl > Imidazole of Histidine > OH of Tyr

  3. Guanidinium of Arg > Imidazole of Histidine > OH of Tyr > α - Amino > α - Carboxyl

  4. Guanidinium of Arg > α-Amino > α - Carboxyl > OH of Tyr > Imidazole of Histidine

  5. Guanidinium of Arg > Imidazole of Histidine > α - Amino > OH of Tyr > α - Carboxyl
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Explanation

Guanidinium of Arg has the highest pKa Range of ~ 12.0.

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