Carboxylic acids having at least one `alpha`-hydrogen react with `Cl_(2)" or "Br_(2)` in the presnence of red phosphorus to give `alpha`-halo acids. The reaction is known as H.V.Z. reaction. The HVZ reaction is limited to the formation of `alpha`-chloro acid and `alpha`-bromo acid and it is sometimes difficult to carry out the reaction. Answer the following questions :
Which of the following carboxylic acids will not give HVZ reaction ?

Options

A. `CH_(3)COOH`
B. `CH_(3)-overset(CH_(3))overset(|)CH-COOH`
C. `CH_(3)-CH_(2)-COOH`
D. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-COOH`

Explanation

To determine which carboxylic acid will not undergo the HVZ reaction, we need to analyze the presence of alpha-hydrogens in the given carboxylic acids. The HVZ (Hunsdiecker-Von Zambon) reaction requires the carboxylic acid to have at least one alpha-hydrogen for the reaction to proceed.

### Step-by-Step Solution:

1. **Identify the Structure of Carboxylic Acids**:
- Carboxylic acids have the general formula RCOOH, where R is a hydrocarbon chain.
- The alpha-carbon (the carbon adjacent to the carboxyl group) must have at least one hydrogen atom (alpha-hydrogen).

2. **List the Given Carboxylic Acids**:
- For this example, let's assume we have the following carboxylic acids:
- A) Acetic acid (CH3COOH)
- B) Propanoic acid (C2H5COOH)
- C) Butanoic acid (C3H7COOH)
- D) Benzoic acid (C6H5COOH)

3. **Check for Alpha-Hydrogens**:
- **Acetic acid (CH3COOH)**: The alpha-carbon (CH3) has 3 hydrogen atoms. It can undergo the HVZ reaction.
- **Propanoic acid (C2H5COOH)**: The alpha-carbon (C2H5) has 2 hydrogen atoms. It can undergo the HVZ reaction.
- **Butanoic acid (C3H7COOH)**: The alpha-carbon (C3H7) has 2 hydrogen atoms. It can undergo the HVZ reaction.
- **Benzoic acid (C6H5COOH)**: The alpha-carbon (attached to the benzene ring) has no hydrogen atoms. It cannot undergo the HVZ reaction.

4. **Conclusion**:
- Among the given options, **Benzoic acid (C6H5COOH)** does not have any alpha-hydrogens and therefore will not participate in the HVZ reaction.

### Final Answer:
The carboxylic acid that will not give the HVZ reaction is **Benzoic acid (C6H5COOH)**.