Pick out the correct statement.

Options

A. Both glycine and p - aminobenzoic acid form dipolar ions
B. Both sulphanilic acid and p - aminobenzoic and form dipolar ions
C. Glycine does not form dipolar ion, but p - aminobenzoic acid forms dipolar ion
D. Both sulphanilic acid and glycine form dipolar ions, but p - aminobenzoic acid does not form dipolar ion

Answer

To solve the question, we need to analyze the statements regarding the formation of dipolar ions by glycine, paramine of benzoic acid, and sulfanelic acid.

### Step-by-Step Solution:

1. **Understanding Dipolar Ions**:
- Dipolar ions, or zwitterions, are molecules that have both positive and negative charges but are overall neutral. They typically form in amino acids where the amino group can become protonated (NH3+) and the carboxylic acid group can lose a proton (COO-).

2. **Analyzing Glycine**:
- Glycine (NH2CH2COOH) is an alpha amino acid. In solution, it can exist in a dipolar form:
- NH2 group can accept a proton to become NH3+.
- COOH group can lose a proton to become COO-.
- Therefore, glycine does form a dipolar ion: NH3+CH2COO-.

3. **Analyzing Sulfanelic Acid**:
- Sulfanelic acid (C6H4(NH2)(SO3H)) is an aromatic amino acid. The sulfonic acid group (SO3H) is a strong acid and can protonate the amino group (NH2) to form a dipolar ion:
- The NH2 group can become NH3+ and the SO3H can remain as SO3-.
- Hence, sulfanelic acid also forms a dipolar ion.

4. **Analyzing Paramine of Benzoic Acid**:
- Paramine of benzoic acid (C6H4(NH2)(COOH)) has an amino group and a carboxylic acid group. However, the carboxylic acid group in this case is not sufficiently acidic to protonate the amino group:
- The amino group does not become NH3+ because the carboxylic acid does not lose a proton easily.
- Therefore, paramine of benzoic acid does not form a dipolar ion.

5. **Conclusion**:
- From the analysis:
- Glycine forms a dipolar ion.
- Sulfanelic acid forms a dipolar ion.
- Paramine of benzoic acid does not form a dipolar ion.
- The correct statement is: "Both sulfanelic acid and glycine form dipolar ions, but paramine of benzoic acid does not form a dipolar ion."

### Final Answer:
The correct option is: **Both sulfanelic acid and glycine form dipolar ions, but paramine of benzoic acid does not form a dipolar ion.**