The reagent with which both acetaldehyde and acetophenone react easily are

Options

A. Fehling's solution
B. Schiff's reagent
C. Tollen's reagent
D. 2, 4 - dinitrophenylhydrazine

Answer

To solve the problem, we need to identify the reagent that can react with both acetaldehyde and acetophenone. Let's analyze the options step by step.

### Step 1: Identify the Compounds
- **Acetaldehyde (CH3CHO)**: This is an aldehyde.
- **Acetophenone (C6H5COCH3)**: This is a ketone.

### Step 2: Understand the Reactivity of Aldehydes and Ketones
- Aldehydes (like acetaldehyde) are generally more reactive than ketones (like acetophenone) when it comes to oxidation reactions.
- Aldehydes can be oxidized to carboxylic acids, while ketones are more resistant to oxidation.

### Step 3: Analyze the Given Reagents
1. **Felling's Solution**: This is a weak oxidizing agent that reacts with aldehydes to form a red precipitate of cuprous oxide (Cu2O). It does not react with ketones.
2. **Sieve Reagent**: This reagent (para-rosaniline hydrochloride) can react with aldehydes to restore its pink color but does not react with ketones.
3. **Toluene Reagent**: This is not a standard reagent for either aldehydes or ketones.
4. **2,4-Dinitrophenylhydrazine (DNPH)**: This reagent reacts with both aldehydes and ketones to form hydrazones.

### Step 4: Determine the Correct Reagent
Since we need a reagent that can react with both acetaldehyde and acetophenone:
- **Felling's Solution**: Reacts only with acetaldehyde.
- **Sieve Reagent**: Reacts only with acetaldehyde.
- **Toluene Reagent**: No significant reaction with either.
- **2,4-Dinitrophenylhydrazine**: Reacts with both acetaldehyde and acetophenone.

### Conclusion
The correct answer is **2,4-Dinitrophenylhydrazine**, as it is the only reagent that reacts with both acetaldehyde and acetophenone.

### Final Answer
The reagent with which both acetaldehyde and acetophenone react easily is **2,4-Dinitrophenylhydrazine**.

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