Which compound undergoes iodoform reaction ?

Options

A. HCHO
B. `CH_(3)CHO`
C. `CH_(3)OH`
D. `CH_(3)COOH`

Answer

To determine which compound undergoes the iodoform reaction, we need to identify the structural requirements for a compound to participate in this reaction. The iodoform reaction is characteristic of compounds that have a methyl ketone group (C=O with a CH3 group attached) or a secondary alcohol that can be oxidized to a methyl ketone.

### Step-by-Step Solution:

1. **Identify the Structural Requirement**:
The iodoform reaction requires the presence of a methyl group adjacent to a carbonyl group (C=O). This can be in the form of a methyl ketone (RCOCH3) or a secondary alcohol (RCHOHCH3) that can be oxidized to a methyl ketone.

2. **Examine the Given Compounds**:
Let's analyze the compounds provided in the question. We need to check if any of them fit the structural requirement mentioned above.

3. **Example of Compounds**:
- **Ethanol (CH3CH2OH)**: This is a primary alcohol and does not contain a methyl ketone structure. Therefore, it does not undergo the iodoform reaction.
- **Acetic Acid (CH3COOH)**: This is a carboxylic acid and does not have the required structure for the iodoform reaction.
- **Acetone (CH3COCH3)**: This is a methyl ketone and will undergo the iodoform reaction.

4. **Perform the Iodoform Reaction**:
For example, if we take acetone and react it with iodine (I2) in the presence of sodium hydroxide (NaOH), a yellow precipitate of iodoform (CHI3) will form, indicating a positive iodoform test.

5. **Conclusion**:
Based on the above analysis, the compound that undergoes the iodoform reaction is **acetone (CH3COCH3)**.

### Final Answer:
The compound that undergoes the iodoform reaction is **acetone (CH3COCH3)**.