Formation of which compound given below from 1- butanol needs an oxidising agent?

Options

A. `CH_(3)CH_(2)CH_(2)CH_(2)Br`
B. `CH_(3)CH_(2)CH_(2)CH=O`
C. `(CH_(3)CH_(2)CH_(2)CH_(2))_(2)O`
D. `CH_(3)-CH_(2)CH=CH_(2)`

Explanation

To determine which compound requires an oxidizing agent for its formation from 1-butanol, we need to analyze the possible products and their formation processes.

### Step-by-Step Solution:

1. **Identify 1-butanol**:
- 1-butanol is a primary alcohol with the structure CH3-CH2-CH2-CH2OH. It has a hydroxyl (-OH) group attached to the first carbon of a four-carbon chain.

2. **Understand Oxidation**:
- Oxidation of alcohols typically involves the loss of hydrogen atoms or the addition of oxygen. For primary alcohols, oxidation can lead to aldehydes or carboxylic acids.

3. **Evaluate the Options**:
- **Option A: Butyl Bromide (C4H9Br)**:
- This compound is formed by replacing the -OH group with a bromine atom. This reaction does not require oxidation; rather, it requires a halogen source.
- **Conclusion**: No oxidizing agent needed.

- **Option B: Butanaldehyde (CH3CH2CH2CHO)**:
- This is an aldehyde formed by the oxidation of 1-butanol. The process involves the removal of hydrogen atoms from the alcohol, which requires an oxidizing agent.
- **Conclusion**: An oxidizing agent is needed.

- **Option C: Ether (e.g., CH3CH2CH2OCH2CH3)**:
- Ethers can be formed from alcohols through dehydration (removal of water) rather than oxidation. This process requires a dehydrating agent, not an oxidizing agent.
- **Conclusion**: No oxidizing agent needed.

- **Option D: Alkene (e.g., CH3CH2CH=CH2)**:
- The formation of alkenes from alcohols typically involves dehydration (removal of water) rather than oxidation. This can occur through either intramolecular or intermolecular dehydration.
- **Conclusion**: No oxidizing agent needed.

4. **Final Conclusion**:
- The compound that requires an oxidizing agent for its formation from 1-butanol is **Butanaldehyde (Option B)**.