Which of the following is an anionic detergent .

Options

A. `CH_(3)(CH_2)_(16)CH_2OSO_3 Na`
B. `CH_(3)(CH_2)_(16)overset(+)(N)(CH_3)_3Cl^(-)`
C. `CH_(3)(CH_2)_(16)COO(CH_2CH_2O)_n CH_2CH_2OH`
D. `C_6H_5SO_3Na `

Answer

To determine which of the following is an anionic detergent, we will analyze the given options based on their chemical structure and the charge they carry.

### Step-by-Step Solution:

1. **Understanding Detergents**:
- Detergents are cleaning agents that can be classified into three categories based on their charge: anionic, cationic, and non-ionic.
- Anionic detergents carry a negative charge, cationic detergents carry a positive charge, and non-ionic detergents have no charge.

2. **Analyzing the Options**:
- We need to look at the chemical structures provided in the options to identify which one is an anionic detergent.

3. **Option A: CH3CH2(16)CH2OSO3Na**:
- This structure has a long hydrocarbon chain (indicated by CH3CH2(16)CH2) and a sulfonate group (OSO3Na).
- The sulfonate group (SO3-) indicates a negative charge, which classifies this as an anionic detergent.

4. **Option B: CH3(CH3)3N+X-**:
- This structure contains a quaternary ammonium ion (N+), which indicates a positive charge.
- Therefore, this is a cationic detergent.

5. **Option C: CH3CH2C(=O)C(=O)OR**:
- This structure represents esters, which do not carry any charge.
- Thus, this is a non-ionic detergent.

6. **Option D: C6H5SO3Na**:
- This structure contains a sulfonate group (SO3-) and a phenyl group (C6H5).
- The presence of the sulfonate group indicates a negative charge, classifying it as an anionic detergent.

7. **Conclusion**:
- Based on the analysis, the correct answers are:
- Option A: CH3CH2(16)CH2OSO3Na (Anionic Detergent)
- Option D: C6H5SO3Na (Anionic Detergent)

### Final Answer:
The anionic detergents from the options provided are **Option A** and **Option D**.