Which of the following detergent belong to ABS-group-

Options

A. Sodium Lauryl sulphate
B. Sodium dodecyl benzene sulphonate
C. Cetytrimethyl ammonium bromide
D. Pentaerythrityl stearate

Answer

To determine which detergent belongs to the ABS (Alkyl Benzene Sulfonate) group, we will analyze the given options step by step.

### Step 1: Understand ABS Group Detergents
ABS group detergents are characterized by the presence of alkyl benzene sulfonates. These are anionic detergents that have a long hydrocarbon chain (typically containing 12 to 18 carbon atoms) attached to a benzene ring, which is then sulfonated.

**Hint:** Look for the presence of a benzene ring and a sulfonate group in the structure of the detergent.

### Step 2: Analyze Each Option
We will evaluate each of the provided detergent options to identify if they belong to the ABS group.

1. **Sodium Lauryl Sulfate (SLS)**
- Structure: CH3-(CH2)11-SO4-Na
- Analysis: This compound does not contain a benzene ring; it is a sulfate salt of a long-chain alcohol.
- Conclusion: **Not ABS.**

2. **Sodium Dodecyl Benzene Sulfonate**
- Structure: CH3-(CH2)10-C6H5-SO3-Na
- Analysis: This compound contains a benzene ring (C6H5) and a sulfonate group (SO3-). It fits the definition of an ABS detergent.
- Conclusion: **This is ABS.**

3. **Cetyltrimethylammonium Bromide**
- Structure: CH3-(CH2)14-N+(CH3)3-Br-
- Analysis: This is a cationic detergent and does not contain a benzene ring or a sulfonate group.
- Conclusion: **Not ABS.**

4. **Pentaerythrityl Stearate**
- Structure: A complex structure that does not include a benzene ring or a sulfonate group.
- Analysis: This compound is an ester and does not fit the ABS category.
- Conclusion: **Not ABS.**

### Step 3: Final Conclusion
After analyzing all the options, the only detergent that belongs to the ABS group is **Sodium Dodecyl Benzene Sulfonate**.

**Final Answer:** Sodium Dodecyl Benzene Sulfonate (Option 2).