Which of the following reaction is not involved in corrosion of iron?

Options

A. `Fe(s) to Fe^(2+)(aq)+2e^-`
B. `4OH^(-)(aq) to O_2(g)+2H_2O(l)+4e^-`
C. `4Fe^(2+)(aq)+O_2(g)+4H_2o(l) to 2Fe_2O_3(s)+8H^+(aq)`
D. `2Fe(s)+o_2(g)+4H^+(aq) to 2Fe^(2+)(aq)+2H_2O(l)`

Answer

To determine which reaction is not involved in the corrosion of iron, we can analyze the oxidation states and the reactions involved in the corrosion process.

### Step-by-Step Solution:

1. **Understanding Corrosion of Iron**:
- Corrosion of iron primarily involves the oxidation of iron. In this process, iron (Fe) loses electrons and is converted from a zero oxidation state (Fe^0) to a higher oxidation state (Fe^2+ or Fe^3+).

2. **Identifying the Reactions**:
- We need to evaluate the given options to see which reaction does not involve the oxidation of iron.

3. **Analyzing Each Option**:
- **Option 1**: This option likely involves the oxidation of iron in the presence of water and oxygen. This is a typical scenario for corrosion, as iron reacts with oxygen and moisture to form rust (Fe2O3·nH2O).
- **Option 2**: This option involves a reaction where oxygen is released, and there is no mention of iron being oxidized. Since corrosion specifically requires iron to oxidize, this reaction is not involved in the corrosion process.
- **Option 3**: This option indicates that iron is oxidized from Fe^2+ to Fe^3+. This is a part of the corrosion process where iron continues to oxidize.

4. **Conclusion**:
- Based on the analysis, **Option 2** is the reaction that is not involved in the corrosion of iron, as it does not involve the oxidation of iron.

### Final Answer:
**Option 2** is not involved in the corrosion of iron.

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