Which among the following is a detergent?

Options

A. Sodium stearate
B. Sodium chloride
C. Sodium carbonate
D. Sodium lauryl sulphate

Explanation

To determine which among the given options is a detergent, we will analyze each option based on their chemical properties and functions.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- Option 1: Sodium stearate
- Option 2: Sodium chloride
- Option 3: Sodium carbonate
- Option 4: Sodium lauryl sulfate

2. **Analyze Option 1 - Sodium Stearate**:
- Sodium stearate is a soap compound. It is a fatty acid salt and does not lather in hard water.
- **Conclusion**: This is not a detergent.

3. **Analyze Option 2 - Sodium Chloride**:
- Sodium chloride (NaCl) is common table salt. It does not have the properties of a detergent.
- **Conclusion**: This is not a detergent.

4. **Analyze Option 3 - Sodium Carbonate**:
- Sodium carbonate (Na2CO3), also known as washing soda, is used for cleaning but is not classified as a detergent.
- **Conclusion**: This is not a detergent.

5. **Analyze Option 4 - Sodium Lauryl Sulfate**:
- Sodium lauryl sulfate is a surfactant and is known for its ability to create lather even in hard water. This qualifies it as a detergent.
- **Conclusion**: This is a detergent.

6. **Final Answer**: Based on the analysis, the correct answer is **Option 4: Sodium lauryl sulfate**.