Which one of the following is a Zwitter ion?

Options

A.
B.
C.
D. `overset(o+)(Na)overset(Theta)(Cl)`

Answer

To determine which of the given options is a zwitterion, we first need to understand the definition and characteristics of a zwitterion.

### Step-by-Step Solution:

1. **Definition of Zwitterion**: A zwitterion is a molecule that has both a positive and a negative charge, but the overall charge of the molecule is neutral. These charges are typically found on different functional groups within the same molecule.

2. **Analyzing the Options**: We will evaluate each of the provided options to see if they fit the definition of a zwitterion.

- **Option 1**: CH3NH3Cl (Methylammonium chloride)
- This molecule has a positive charge on the NH3+ group and a negative charge on the Cl- ion. However, these charges are not on the same molecule but rather on separate ions, so this is not a zwitterion.

- **Option 2**: NH3+ and SO3− (Amino sulfonic acid)
- In this case, the NH3+ group carries a positive charge, while the SO3− group carries a negative charge. Both charges are present in the same molecule, fulfilling the definition of a zwitterion.

- **Option 3**: O+ and Cl− (Oxygen cation with chloride)
- Here, O+ and Cl− are also separate ions, similar to Option 1. Thus, this is not a zwitterion.

- **Option 4**: Na+ and Cl− (Sodium chloride)
- This is a classic ionic compound where Na+ and Cl− are separate ions. Therefore, this is not a zwitterion.

3. **Conclusion**: Based on the analysis, the only option that qualifies as a zwitterion is the one with NH3+ and SO3−.

### Final Answer:
The zwitterion among the options is the one containing NH3+ and SO3−.