Which of the following is an anionic detergent?

Options

A. Cetyltrimethyl ammonium bromide
B. Glyceryl Oleate.
C. Sodium stearate.
D. Sodium lauryl sulphate.

Explanation

To determine which of the given options is an anionic detergent, we will analyze each of the four options provided in the question.

### Step-by-Step Solution:

1. **Understanding Detergents**:
- Detergents are surfactants used for cleaning. They can be classified into three main categories: anionic, cationic, and non-ionic (neutral).
- Anionic detergents have a negative charge, cationic detergents have a positive charge, and non-ionic detergents have no charge.

2. **Analyzing the Options**:
- **Option A: Sityl trimethylammonium bromide**:
- This compound has a nitrogen atom with a positive charge (due to the trimethylammonium group) and a bromide ion with a negative charge.
- Since it has a positive charge, it is classified as a cationic detergent, not anionic.

- **Option B: Glyceryl oleate**:
- Glyceryl oleate is derived from olive oil and is used as a flavoring agent.
- It does not possess any charge that would classify it as either anionic or cationic. Thus, it is not a detergent.

- **Option C: Sodium stearate**:
- Sodium stearate is a soap, which is a type of detergent but specifically a salt of a fatty acid.
- While it does have a negative charge (the stearate ion), it is primarily classified as a soap rather than a synthetic detergent, so it does not fit the typical classification of anionic detergents.

- **Option D: Sodium lauryl sulfate**:
- Sodium lauryl sulfate has a sulfate group that carries a negative charge.
- It is widely recognized as an anionic detergent due to its cleansing properties and the presence of the negatively charged sulfate group.

3. **Conclusion**:
- After analyzing all the options, the only compound that fits the definition of an anionic detergent is **sodium lauryl sulfate**.

### Final Answer:
The correct answer is **sodium lauryl sulfate** (Option D).