Which of the following is an anionic detergent ?

Options

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

Answer

To determine which of the following is an anionic detergent, we will analyze each option provided:

### Step 1: Understand the Types of Detergents
Detergents can be classified into three main categories:
- **Anionic Detergents**: These have a negative charge on their hydrophilic (water-attracting) part.
- **Cationic Detergents**: These have a positive charge on their hydrophilic part.
- **Non-ionic Detergents**: These do not carry any charge.

### Step 2: Analyze Each Option
1. **Option A: Sodium Lauryl Sulfate**
- Sodium lauryl sulfate (SLS) is known to be an anionic detergent. Its structure includes a long hydrocarbon chain (which is hydrophobic) and a sulfate group (which is negatively charged).
- Conclusion: **Anionic detergent.**

2. **Option B: Cetyl Trimethyl Ammonium Bromide**
- This compound is a cationic detergent. It has a positively charged ammonium group, which makes it cationic.
- Conclusion: **Not anionic detergent.**

3. **Option C: Glyceryl Oleate**
- Glyceryl oleate is an ester derived from glycerol and oleic acid. It is not classified as a detergent but rather as an emulsifier and is typically a yellow liquid.
- Conclusion: **Not anionic detergent.**

4. **Option D: Sodium Stearate**
- Sodium stearate is the sodium salt of stearic acid and is commonly used in soap. While it is a soap, it is also considered an anionic surfactant.
- Conclusion: **Anionic detergent.**

### Step 3: Identify the Correct Answer
From the analysis:
- **Option A (Sodium Lauryl Sulfate)** is an anionic detergent.
- **Option D (Sodium Stearate)** is also an anionic detergent but is primarily known as soap.

Since the question asks for an anionic detergent and Sodium Lauryl Sulfate is a well-known example, we can conclude that:

**Correct Answer: Option A - Sodium Lauryl Sulfate.**