Amongst the following compounds, the one which would not respond to iodoform test is

Options

A. `CH_(3)CH(OH)CH_(2)CH_(3)`
B. `ICH_(2)COCH_(2)CH_(3)`
C. `CH_(3)COOH`
D. `CH_(3)CHO`

Explanation

To determine which compound among the given options does not respond to the iodoform test, we first need to understand the criteria for a compound to give a positive iodoform test.

### Step-by-Step Solution:

1. **Understanding the Iodoform Test**:
The iodoform test is used to identify the presence of methyl ketones (compounds with the structure RCOCH3) or secondary alcohols that can be oxidized to methyl ketones. Compounds that do not contain a methyl group adjacent to a carbonyl group (C=O) or do not have a structure that can be oxidized to a methyl ketone will not give a positive test.

2. **Analyzing the Compounds**:
- **Compound 1: CH3-CH(OH)-CH2-CH3 (Butanol)**: This is a secondary alcohol. Upon oxidation, it can form a methyl ketone, hence it will give a positive iodoform test.
- **Compound 2: CH3-CO-CH2-CH3 (Butan-2-one)**: This is a methyl ketone (specifically, it is 2-butanone). It will also give a positive iodoform test.
- **Compound 3: CH3COOH (Acetic Acid)**: This is a carboxylic acid and does not have a methyl ketone structure. Carboxylic acids and their derivatives do not respond to the iodoform test.
- **Compound 4: CH3CHO (Acetaldehyde)**: This is an aldehyde that can be oxidized to a methyl ketone, thus it will give a positive iodoform test.

3. **Conclusion**:
Among the given compounds, **acetic acid (CH3COOH)** does not respond to the iodoform test.

### Final Answer:
The compound that would not respond to the iodoform test is **acetic acid (CH3COOH)**.