What is Jone's reagent ?

Answer

### Step-by-Step Solution:

1. **Definition of Jones Reagent**:
Jones reagent is a chemical reagent used primarily for the oxidation of alcohols.

2. **Composition of Jones Reagent**:
The Jones reagent is composed of chromium trioxide (CrO3) in the presence of sulfuric acid (H2SO4). The typical preparation involves mixing CrO3 with H2SO4 and water, often in acetone.

3. **Oxidation Reactions**:
- **Primary Alcohols**: When a primary alcohol (RCH2OH) is treated with Jones reagent, it gets oxidized to a carboxylic acid (RCOOH).
- **Secondary Alcohols**: When a secondary alcohol (R1R2CHOH) is treated with Jones reagent, it is oxidized to a ketone (R1R2C=O).

4. **Summary of Uses**:
Thus, Jones reagent is primarily used for:
- Oxidizing primary alcohols to carboxylic acids.
- Oxidizing secondary alcohols to ketones.

5. **Conclusion**:
In summary, Jones reagent is a powerful oxidizing agent used in organic chemistry for the oxidation of alcohols to their corresponding carbonyl compounds.