Which of the following acids are likely to form zwitter ions?

Options

A.
B.
C.
D.

Answer

To determine which of the given acids are likely to form zwitterions, we need to understand what a zwitterion is. A zwitterion is a molecule that contains both positive and negative charges but is overall electrically neutral. This typically occurs in amino acids and some other compounds.

### Step-by-Step Solution:

1. **Understanding Zwitterions**:
- A zwitterion has both a positively charged group (usually an ammonium group, -NH3⁺) and a negatively charged group (usually a carboxylate group, -COO⁻) within the same molecule.

2. **Analyzing Each Option**:
- **Option 1**: NH2-CH-CH3-COOH
- If we remove an H from the carboxylic acid (-COOH) and add it to the amine (-NH2), we can form NH3⁺-CH-CH3-COO⁻. This shows both a positive and a negative charge, making it a zwitterion.

- **Option 2**: C(=O)OH-CH-CH-NH2-COOH
- By removing an H from the carboxylic acid and adding it to the amine, we can form COO⁻-CH-CH-NH3⁺. This also has both charges, qualifying it as a zwitterion.

- **Option 3**: H-CH2-CH2-CH2-CH-NH2-COOH
- Similar to the previous options, if we remove an H from the carboxylic acid and add it to the amine, we can form COO⁻-CH2-CH2-CH2-CH-NH3⁺. This also results in a zwitterion.

- **Option 4**: Benzene-OH-CH2-CH-CH3-NH2
- Here, if we remove an H from the amine and add it to the hydroxyl group, we can form NH3⁺-CH2-CH-CH3-O⁻. This also shows both positive and negative charges, making it a zwitterion.

3. **Conclusion**:
- All four options can form zwitterions. Therefore, the answer is that options 1, 2, 3, and 4 are all likely to form zwitterions.

### Final Answer:
- **Options 1, 2, 3, and 4 are likely to form zwitter ions.**