Which of the following molecule is capable of forming zwitter ion ?

Options

A. `CH_(3)-CHOH-NH_(2)`
B. `NH_(2)CH_(2)COOH`
C. `CH_(3)-COOH`
D. `C Cl_(3)-NO_(2)`

Answer

To determine which of the given molecules is capable of forming a zwitterion, we first need to understand what a zwitterion is. A zwitterion is a molecule that has both a positive and a negative charge but is overall electrically neutral. This typically occurs in molecules that contain both an amine group (-NH2) and a carboxylic acid group (-COOH), where one functional group can donate a proton (H+) to the other.

### Step-by-Step Solution:

1. **Identify the Given Molecules**: The molecules provided in the question are:
- CH3, CHOH
- NH2, CH2, COOH
- CH3, COOH
- CCL3, NO2

2. **Analyze Each Molecule for Zwitterion Formation**:
- **Molecule 1: CH3, CHOH**
- This molecule does not contain both an amine and a carboxylic acid group. There is no functional group capable of transferring H+, so it cannot form a zwitterion.

- **Molecule 2: NH2, CH2, COOH**
- This molecule contains an amine group (NH2) and a carboxylic acid group (COOH). The hydrogen from the COOH can be transferred to the NH2, resulting in NH3+ and COO-. This results in a zwitterion.

- **Molecule 3: CH3, COOH**
- This molecule has a carboxylic acid group (COOH) but lacks an amine group. Therefore, there is no group to accept a proton, and it cannot form a zwitterion.

- **Molecule 4: CCL3, NO2**
- This molecule does not contain any functional groups capable of transferring protons (H+). Hence, it cannot form a zwitterion.

3. **Conclusion**: The only molecule that can form a zwitterion is the second one: NH2, CH2, COOH. This is typically an amino acid, such as glycine, which exists in zwitterionic form in solution.

### Final Answer:
The molecule capable of forming a zwitterion is **NH2, CH2, COOH**.