The carboxylic acid that does not undergo HVZ reaction is

Options

A. ` CH_3COOH`
B. ` (CH_3)_2COOH`
C. ` CH_3CH_2CH_2CH_2COOH`
D. ` (CH_3)_3C C OOH`

Explanation

To determine the carboxylic acid that does not undergo the HVZ (Hunsdiecker-Von Baeyer) reaction, we need to understand the requirements for this reaction to occur. The HVZ reaction involves the halogenation of the alpha carbon of a carboxylic acid that contains at least one alpha hydrogen atom.

### Step-by-Step Solution:

1. **Understanding the HVZ Reaction**:
- The HVZ reaction is a halogenation reaction that occurs at the alpha carbon of carboxylic acids.
- For a carboxylic acid to undergo this reaction, it must have at least one alpha hydrogen atom (hydrogen atom attached to the carbon adjacent to the carboxylic acid group).

2. **Identifying Alpha Hydrogen**:
- The alpha carbon is the carbon atom directly adjacent to the carboxylic acid group (-COOH).
- If the alpha carbon has hydrogen atoms (alpha hydrogens), the carboxylic acid can undergo the HVZ reaction.

3. **Analyzing the Given Options**:
- **Option 1**: CH3COOH (Acetic Acid)
- This has an alpha carbon (the methyl group) with 3 alpha hydrogens. It can undergo HVZ reaction.
- **Option 2**: (CH3)2CHCOOH (Isobutyric Acid)
- This has an alpha carbon with 1 alpha hydrogen. It can undergo HVZ reaction.
- **Option 3**: CH3CH2CH2COOH (Butyric Acid)
- This has an alpha carbon with 2 alpha hydrogens. It can undergo HVZ reaction.
- **Option 4**: (CH3)3C-COOH (Tert-butanoic Acid)
- This has an alpha carbon (the carbon attached to the -COOH) with no alpha hydrogens (the three methyl groups do not provide any hydrogen on the alpha carbon). Therefore, it cannot undergo the HVZ reaction.

4. **Conclusion**:
- The carboxylic acid that does not undergo the HVZ reaction is **Option 4: (CH3)3C-COOH (Tert-butanoic Acid)**.

### Final Answer:
The carboxylic acid that does not undergo HVZ reaction is **(CH3)3C-COOH (Tert-butanoic Acid)**.