Iodination of methane can be carried out in presence of -

Options

A. `HIO_(3)`
B. `HBrO_(3)`
C. `HCIO_(3)`
D. HCl

Answer

To answer the question "Iodination of methane can be carried out in presence of -", we need to understand the process of iodination and the role of oxidizing agents in this reaction. Here’s a step-by-step solution:

### Step 1: Understanding Iodination of Methane
Iodination of methane involves the reaction of methane (CH₄) with iodine (I₂) to form iodomethane (CH₃I) and hydrogen iodide (HI). The reaction can be represented as:
\[ \text{CH}_4 + \text{I}_2 \rightleftharpoons \text{CH}_3\text{I} + \text{HI} \]

### Step 2: Identifying the Nature of the Reaction
This reaction is reversible, meaning that the products can revert to the reactants. The presence of hydrogen iodide (HI) as a by-product can lead to the reduction of iodomethane back to methane, making direct iodination inefficient.

### Step 3: Role of Oxidizing Agents
To facilitate the iodination of methane and prevent the reverse reaction, we need to use oxidizing agents. Oxidizing agents are substances that accept electrons and, in the process, oxidize other substances while getting reduced themselves.

### Step 4: Common Oxidizing Agents for Iodination
The common oxidizing agents used for the iodination of methane include:
- **HIO₃ (Iodic acid)**
- **HNO₃ (Nitric acid)**
- **Mercuric oxide (HgO)**

These oxidizing agents help in converting HI back to iodine (I₂), thus driving the reaction forward and allowing the iodination to occur effectively.

### Step 5: Conclusion
Based on the above analysis, the iodination of methane can be carried out in the presence of oxidizing agents such as HIO₃, HNO₃, or mercuric oxide (HgO).

### Final Answer
Iodination of methane can be carried out in the presence of **HIO₃ (iodic acid)**, **HNO₃ (nitric acid)**, or **mercuric oxide (HgO)**.

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