Iodoform reaction is given by

Options

A.
B.
C. `CH_(3)-CH_(2)-CHO`
D. All of these

Answer

To solve the question regarding the iodoform reaction, we need to understand the conditions and requirements for a compound to undergo this reaction. The iodoform reaction is specifically characteristic of certain types of compounds, particularly those containing a methyl ketone or a primary alcohol that can be oxidized to a methyl ketone.

### Step-by-Step Solution:

1. **Identify the Requirements for Iodoform Reaction**:
The iodoform reaction occurs with compounds that have the structure RCOCH3 (methyl ketones) or compounds that can be oxidized to this structure. This means we are looking for a carbonyl group (C=O) adjacent to a methyl group (CH3).

2. **Reagents Involved**:
The reaction involves iodine (I2) and sodium hydroxide (NaOH). When these reagents are present, they react with the suitable compounds to form iodoform (CHI3), which is a yellow precipitate.

3. **Mechanism of the Reaction**:
- The base (NaOH) abstracts an alpha hydrogen from the methyl group adjacent to the carbonyl, forming an enolate ion.
- This enolate ion then reacts with iodine to form an iodo compound.
- The process repeats, leading to the formation of triiodomethane (CHI3) and a carboxylate ion.

4. **Final Product**:
The final product of the iodoform reaction is triiodomethane (CHI3), which is characterized by its yellow color.

5. **Identifying Compounds that Undergo the Reaction**:
To determine which compounds will give the iodoform reaction, we must check each option provided in the question to see if they contain the required RCOCH3 structure or can be oxidized to it.

6. **Conclusion**:
After analyzing the options, the correct answer will be the compound that contains the methyl ketone structure or can be oxidized to it.