Chapter 20, Problem 20.38QP

(a)

Interpretation Introduction

Interpretation: The condensed structural formula of tyrosine at the give condition of $\text{pH}$ of the solution is to be identified.

Concept introduction: At acidic $\text{pH}$, the amino group of amino acid exist as ammonium ion.

At basic $\text{pH}$, the carboxylic group of amino acid exist as carboxylate ion.

At $\text{pH}=\text{p}I$, the amino acid exist as zwitter ion.

To determine: The condensed structure of tyrosine representing its existence in the strongly acidic solution.

(b)

Interpretation Introduction

To determine: The condensed structure of tyrosine representing its existence in the strongly basic solution.

(c)

Interpretation Introduction

To determine: The condensed structure of tyrosine representing its existence in the solution in which $\text{pH}=\text{p}I$.