In Iodination for preparation of iodomethane compound used is

Options

A. `HIO_(3)`
B. HgO
C. Both (1) and (2)
D. HI

Answer

To solve the question regarding the compound used in the iodination for the preparation of iodomethane, we can break down the process step by step.

### Step 1: Understanding Iodination
Iodination is a chemical reaction that involves the introduction of iodine into an organic compound. In the case of preparing iodomethane (CH3I), we are specifically looking at the iodination of methane (CH4).

### Step 2: Identifying the Reactants
The primary reactant for the iodination of methane is iodine (I2). When methane reacts with iodine, it can undergo a substitution reaction where one of the hydrogen atoms is replaced by an iodine atom.

### Step 3: Reaction Mechanism
The general reaction can be represented as follows:
\[ \text{CH}_4 + \text{I}_2 \rightarrow \text{CH}_3\text{I} + \text{HI} \]
In this reaction, methane (CH4) reacts with iodine (I2) to produce iodomethane (CH3I) and hydrogen iodide (HI).

### Step 4: Role of HI
Hydrogen iodide (HI) is produced as a by-product in this reaction. It can act as a reducing agent, which means it can potentially reverse the iodination reaction if not controlled.

### Step 5: Controlling the Reaction
To ensure that the reaction proceeds in the desired direction and to prevent the reverse reaction, we need to use an oxidizing agent. Common oxidizing agents include HIO3 (iodic acid) and HgO (mercury(II) oxide). These compounds help to consume the HI produced, thus driving the reaction towards the formation of more iodomethane.

### Conclusion
In summary, the compound used in the iodination for the preparation of iodomethane is iodine (I2), and to facilitate the reaction and prevent reversibility, oxidizing agents like HIO3 or HgO are also utilized.

### Final Answer
The compound used in the iodination for the preparation of iodomethane is iodine (I2).

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