Which of the following reactions does not proceed in forward direction?

Options

A. `Ph_(3)C-H+CH_(3)(CH_(2))_(3)NararrPh_(3)CNa+CH_(3)(CH_(2))_(2)CH_(3)`
B.
C. `CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)+C_(2)H_(5)overset(Ɵ)ONoverset(o+)a`
`rarrCH_(3)-overset(O)overset(||)C-CH=overset(Ɵo+)overset(ONa)overset(|)C-CH_(3)+C_(2)H_(5)OH`
D.

Explanation

To determine which of the following reactions does not proceed in the forward direction, we need to analyze the strength of the acids involved in each reaction. The key principle is that a stronger acid can displace a weaker acid in a reaction.

### Step-by-Step Solution:

1. **Identify the Acids Involved**:
- We need to identify the acids in the reactions provided. For example, if we have Acid 1 (let's say it's phenyl C-H3) and Acid 2 (like carbonic acid H2CO3), we need to compare their strengths.

2. **Compare Acid Strengths**:
- The reaction will proceed in the forward direction if Acid 1 is stronger than Acid 2. If Acid 1 is weaker than Acid 2, the reaction will not proceed in the forward direction.

3. **Evaluate the Given Acids**:
- In the example given, if Acid 1 is phenyl C-H3 and Acid 2 is carbonic acid (H2CO3), we need to determine which one is stronger.
- Phenyl C-H3 is a weaker acid compared to carbonic acid, which is a stronger acid.

4. **Conclusion**:
- Since phenyl C-H3 (Acid 1) is weaker than carbonic acid (Acid 2), the reaction will not proceed in the forward direction.

5. **Repeat for Other Reactions**:
- If there are other reactions, repeat the same process of identifying the acids and comparing their strengths to determine if the reaction will proceed or not.

### Final Answer:
The reaction involving phenyl C-H3 and carbonic acid does not proceed in the forward direction because phenyl C-H3 is a weaker acid compared to carbonic acid.