Which of the following is a correct statement?:

Options

A. `C_(2)H_(5)`Br reacts with alco. KOH to give `C_(2)H_(5)`OH
B. Reaction of `C_(2)H_(5)` Br with metallic Na gives ethane
C. `C_(2)H_(5)` Br reacts with sodium ethoxide to give ether
D. `C_(2)H_(5)`Br reacts with AgCN to give ethyl cyanide

Answer

To determine which of the given statements is correct regarding the reactions of C2H5Br (bromethane), we will analyze each option step by step.

### Step 1: Analyze Option 1
**Statement:** C2H5Br reacts with alcoholic KOH to give C2H5OH.

**Analysis:**
- When C2H5Br reacts with alcoholic KOH, it undergoes an elimination reaction rather than a substitution reaction.
- The expected product would be an alkene (C2H4) instead of an alcohol (C2H5OH).
- Therefore, this statement is **not correct**.

### Step 2: Analyze Option 2
**Statement:** Reaction of C2H5Br with metallic sodium gives ethane.

**Analysis:**
- The reaction of C2H5Br with metallic sodium is known as the Wurtz reaction.
- In this reaction, two molecules of C2H5Br react with two sodium atoms to form butane (C4H10) and sodium bromide (NaBr).
- Therefore, this statement is **not correct**.

### Step 3: Analyze Option 3
**Statement:** C2H5Br reacts with sodium ethoxide to give ether.

**Analysis:**
- When C2H5Br reacts with sodium ethoxide (C2H5O-Na+), it undergoes a nucleophilic substitution reaction.
- The product of this reaction is diethyl ether (C2H5OC2H5) and sodium bromide (NaBr).
- Therefore, this statement is **correct**.

### Step 4: Analyze Option 4
**Statement:** C2H5Br reacts with AgCN to give ethyl cyanide.

**Analysis:**
- When C2H5Br reacts with silver cyanide (AgCN), it forms ethyl isocyanide (C2H5N=C) instead of ethyl cyanide (C2H5CN).
- Therefore, this statement is **not correct**.

### Conclusion
The correct statement among the options provided is **Option 3**, which states that C2H5Br reacts with sodium ethoxide to give ether.

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