The reagent used in the conversion of 1-butanol to 1-bromobutane is :

Options

A. `CHBr_(3)`
B. `Br_(3)`
C. `CH_(3)Br`
D. `PBr_(3)`

Answer

To convert 1-butanol to 1-bromobutane, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants:**
- The starting material is 1-butanol, which has the structure CH3-CH2-CH2-CH2OH.

2. **Choose the Appropriate Reagent:**
- To convert an alcohol to a bromoalkane, we need a reagent that can facilitate the substitution of the hydroxyl (-OH) group with a bromine atom (Br).

3. **Use of Phosphorus Tribromide (PBr3):**
- Phosphorus tribromide (PBr3) is a suitable reagent for this conversion. When 1-butanol reacts with PBr3, the lone pair of electrons on the oxygen atom of the alcohol attacks the phosphorus atom in PBr3.

4. **Formation of an Intermediate:**
- This reaction leads to the formation of an oxonium ion intermediate, where the hydroxyl group is converted into a better leaving group, resulting in the release of a bromide ion (Br-).

5. **Substitution Reaction:**
- The bromide ion (Br-) then attacks the carbon atom that was bonded to the hydroxyl group, resulting in the substitution of the -OH group with a bromine atom.

6. **Final Product:**
- The final product of this reaction is 1-bromobutane (CH3-CH2-CH2-CH2Br).

### Conclusion:
The reagent used in the conversion of 1-butanol to 1-bromobutane is **Phosphorus Tribromide (PBr3)**.