Which of the following when treated with a Grignard reagent yield (s) an alkane?

Options

A. `H_2O`
B. `C_2H_5OH`
C. both `H_2O` and `CH_3CH_2OH`
D. none of the two

Answer

To solve the question "Which of the following when treated with a Grignard reagent yield(s) an alkane?", we need to understand the behavior of Grignard reagents and their reactions with different compounds.

### Step-by-Step Solution:

1. **Understanding Grignard Reagents**:
- Grignard reagents are organomagnesium compounds, typically represented as R-MgX, where R is an alkyl or aryl group and X is a halogen. For example, methyl magnesium bromide (CH3MgBr) is a common Grignard reagent.

2. **Reactions of Grignard Reagents**:
- Grignard reagents are highly reactive and can react with various electrophiles. One of the key reactions is with water (H2O) or alcohols (R'OH).

3. **Reaction with Water**:
- When a Grignard reagent like CH3MgBr reacts with water, it produces methane (CH4) and magnesium hydroxide bromide (Mg(OH)Br):
\[ \text{CH}_3\text{MgBr} + \text{H}_2\text{O} \rightarrow \text{CH}_4 + \text{Mg(OH)Br} \]
- Here, methane is an alkane.

4. **Reaction with Alcohol**:
- Similarly, when CH3MgBr reacts with an alcohol (e.g., ethanol, C2H5OH), it also produces methane:
\[ \text{CH}_3\text{MgBr} + \text{C}_2\text{H}_5\text{OH} \rightarrow \text{CH}_4 + \text{C}_2\text{H}_5\text{O} \text{MgBr} \]
- Again, methane is formed as a product.

5. **Conclusion**:
- From the above reactions, we can conclude that Grignard reagents can yield alkanes when treated with water or alcohols. Therefore, the answer to the question is that both water and alcohol can yield alkanes when treated with a Grignard reagent.

### Final Answer:
Grignard reagents yield alkanes when treated with both water and alcohol.

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