Ketones can be converted to tertiary alcohols by

Options

A. Reduction
B. Oxidation
C. Reaction with Grignard reagent
D. All of these

Answer

To convert ketones to tertiary alcohols, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ketones**:
- Ketones are organic compounds characterized by a carbonyl group (C=O) bonded to two carbon atoms. The general formula for a ketone is R1(C=O)R2, where R1 and R2 can be alkyl or aryl groups.

2. **Reduction of Ketones**:
- Ketones can be reduced to secondary alcohols using reducing agents like lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4). However, this will yield a secondary alcohol, not a tertiary alcohol.

3. **Using Grignard Reagents**:
- To convert a ketone into a tertiary alcohol, we can use Grignard reagents (R-MgX). Grignard reagents are organomagnesium compounds that can add a carbon atom to the carbonyl carbon of the ketone.

4. **Reaction Mechanism**:
- When a Grignard reagent reacts with a ketone, it adds to the carbonyl carbon, forming an alkoxide intermediate. This intermediate can then be protonated (usually by adding water in an acidic medium) to yield the corresponding tertiary alcohol.

5. **Final Reaction**:
- The overall reaction can be summarized as follows:
- Ketone + R-MgX → Alkoxide intermediate → Tertiary alcohol (after protonation)

6. **Conclusion**:
- Therefore, the correct method to convert ketones to tertiary alcohols is by reacting them with Grignard reagents.

### Final Answer:
Ketones can be converted to tertiary alcohols by reacting with Grignard reagents (R-MgX).