Glycine exists as `NH_(3)""^(+)CH_(2)COO^(-)` , zwitter ion but anthranilic acid (p-amino benzoic acid) does not exist as zwitter ion. Why?

Explanation

To understand why glycine exists as a zwitterion while anthranilic acid (p-amino benzoic acid) does not, we need to analyze the structures and properties of both compounds.

### Step 1: Understanding Glycine Structure
Glycine is the simplest amino acid with the structure:
\[ \text{NH}_2\text{-CH}_2\text{-COOH} \]

In this structure:
- The amino group (\( \text{NH}_2 \)) can accept a proton (\( \text{H}^+ \)), becoming positively charged (\( \text{NH}_3^+ \)).
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