Which of the following statement is correct?

Options

A. `C_(2)H_(5)Br` reacts with `C_(2)H_(5)ON a` to form diethyl ether
B. `C_(2)H_(5)Br` reacts with AgCN to form ethyl cyanide
C. `C_(2)H_(5)Br` reacts with alc. KOH to form `C_(2)H_(5)OH`
D. `C_(2)H_(5)Br` on treatment with Na gives `C_(2)H_(5)OH`

Answer

To determine which of the given statements is correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1**: C2H5Br reacts with C2H5ONa to form diethyl ether.
- **Reaction**: C2H5Br + C2H5ONa → C2H5OC2H5 + NaBr
- **Explanation**: This reaction is known as Williamson synthesis, where an alkyl halide reacts with an alkoxide to form an ether. Therefore, this statement is **correct**.

2. **Statement 2**: C2H5Br reacts with AgCN to form ethyl cyanide.
- **Reaction**: C2H5Br + AgCN → C2H5CN + AgBr
- **Explanation**: The product formed is ethyl cyanide (or ethyl isocyanide), which is not the expected product from this reaction. The correct product is ethyl cyanide, but the statement is misleading as it does not specify the correct nomenclature. Therefore, this statement is **incorrect**.

3. **Statement 3**: C2H5Br reacts with alcoholic KOH to form C2H5OH.
- **Reaction**: C2H5Br + KOH (alcoholic) → C2H4 + KBr + H2O
- **Explanation**: The reaction of C2H5Br with alcoholic KOH leads to elimination, forming ethene (C2H4) rather than ethanol (C2H5OH). Therefore, this statement is **incorrect**.

4. **Statement 4**: C2H5Br on treatment with Na gives C2H5OH.
- **Reaction**: C2H5Br + 2Na → C2H6 + NaBr
- **Explanation**: The reaction of C2H5Br with sodium typically leads to the formation of butane (C4H10) in the presence of dry ether, not ethanol. Therefore, this statement is **incorrect**.

### Conclusion:
The correct statement among the options provided is **Statement 1**.

### Final Answer:
The correct statement is: **C2H5Br reacts with C2H5ONa to form diethyl ether.**

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