Which of the following is not a biodegradable detergent ?

Options

A. `CH_3-(CH_2)_(8)-underset(O)underset(||)overset(O)overset(||)(S)-ONa`
B. `CH_3-underset(CH_3)underset(|)overset(CH_3)overset(|)(C )-overset(CH_3)overset(|)(CH)-overset(CH_3)overset(|)(CH)-SO_3Na`
C. `CH_3-(CH_2)_(12)-CH_2-underset(O)underset(||)overset(O)overset(||)(S)-ONa`
D. All of these

Answer

To determine which of the following detergents is not biodegradable, we need to understand the characteristics that differentiate biodegradable detergents from non-biodegradable ones.

### Step-by-Step Solution:

1. **Understanding Biodegradable vs Non-Biodegradable Detergents**:
- Biodegradable detergents can be broken down by natural processes, typically characterized by a straight hydrocarbon chain.
- Non-biodegradable detergents resist decomposition and usually have branched hydrocarbon chains.

2. **Analyze the Given Options**:
- We will analyze each option to identify the structure of the hydrocarbon chain.

3. **Option A**:
- The structure is given as a straight alkyl chain (CH3 followed by 8 CH2 groups and an SO3NA group).
- Since it has a straight hydrocarbon chain, it is biodegradable.

4. **Option B**:
- The structure shows multiple branchings in the hydrocarbon chain.
- The presence of branched chains indicates that this detergent is non-biodegradable.

5. **Option C**:
- This option presents a straight hydrocarbon chain (CH3 followed by 12 CH2 groups and an SO3NA group).
- Like Option A, it has a straight chain, making it biodegradable.

6. **Conclusion**:
- After analyzing all options, we find that Option B is the one that is not biodegradable due to its branched hydrocarbon structure.

### Final Answer:
**Option B is not a biodegradable detergent.**