Which of the following will not be soluble in sodium hydrogen carbonate?

Options

A. `2, 4, 6-`Trinitrophenol
B. benzoic acid
C. `p-`Nitrophenol
D. Benzenesulphonic acid

Explanation

To determine which compound will not be soluble in sodium hydrogen carbonate (NaHCO3), we need to analyze the acidic strength of the compounds in question. Sodium hydrogen carbonate reacts with acids to produce a sodium salt, water, and carbon dioxide gas. The key point is that only acids stronger than carbonic acid (H2CO3) will react with NaHCO3.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We need to identify the compounds in the question. Let's assume the compounds are:
- Benzene sulfonic acid
- Benzoic acid
- Carbonic acid (H2CO3)
- Phenol
- Para-nitrophenol
- 2,4,6-trinitrophenol

2. **Understand Acidic Strength**:
The acidic strength of the compounds generally follows this order:
- Benzene sulfonic acid > Benzoic acid > Carbonic acid (H2CO3) > Phenol > Para-nitrophenol

3. **Evaluate Each Compound**:
- **Benzene sulfonic acid**: Strong acid, reacts with NaHCO3.
- **Benzoic acid**: Stronger than H2CO3, reacts with NaHCO3.
- **Carbonic acid (H2CO3)**: Reference acid, does not react with NaHCO3.
- **Phenol**: Less acidic than H2CO3, does not react with NaHCO3.
- **Para-nitrophenol**: Slightly more acidic than phenol but still less than H2CO3, does not react with NaHCO3.
- **2,4,6-trinitrophenol**: Very acidic due to three nitro groups, reacts with NaHCO3.

4. **Conclusion**:
The compounds that do not react with sodium hydrogen carbonate are **Phenol** and **Para-nitrophenol**. However, since the question asks for one specific compound, the answer is **Para-nitrophenol**.

### Final Answer:
**Para-nitrophenol will not be soluble in sodium hydrogen carbonate.**