Which of the following process do not yield alcohols ?

Options

A. Acid catalyst hydration of alkenes
B. Hydroboration-oxidation of alkenes
C. Reduction of aldehydes
D. Free radical halogenation of alkanes

Answer

To determine which process does not yield alcohols, we will analyze each of the processes mentioned and see if they produce alcohols or not.

### Step 1: Analyze Acid-Catalyzed Hydration of Alkenes
- In this process, alkenes react with water in the presence of an acid catalyst.
- The alkene undergoes electrophilic addition, resulting in the formation of an alcohol.
- **Conclusion**: This process yields alcohols.

### Step 2: Analyze Hydration of Alkynes
- Similar to alkenes, alkynes can also undergo hydration.
- When treated with water in the presence of a catalyst (like BH3), alkynes can form alcohols.
- **Conclusion**: This process yields alcohols.

### Step 3: Analyze Reduction of Aldehydes
- Aldehydes can be reduced to form alcohols using reducing agents (like LiAlH4).
- This reduction process converts the carbonyl group of the aldehyde into a hydroxyl group, forming an alcohol.
- **Conclusion**: This process yields alcohols.

### Step 4: Analyze Free Radical Halogenation
- Free radical halogenation involves the reaction of alkenes with halogens (like Cl2 or Br2) under radical conditions.
- This process results in the formation of alkyl halides, not alcohols.
- **Conclusion**: This process does not yield alcohols.

### Final Conclusion
Among the processes analyzed, the free radical halogenation does not yield alcohols.