The compound which gives a positive haloform test and a positive Fehling solution test is :

Options

A. acetone
B. acetaldehyde
C. formaldehyde
D. diethyl ether

Answer

To solve the question regarding which compound gives a positive haloform test and a positive Fehling's solution test, we can follow these steps:

### Step 1: Understanding the Tests
- **Haloform Test**: This test is used to identify methyl ketones (or aldehydes with an alpha-methyl group). A positive result indicates the presence of a methyl group adjacent to the carbonyl group.
- **Fehling's Test**: This test is used to detect aldehydes. A positive result is indicated by the reduction of the deep blue copper(II) solution to a red precipitate of copper(I) oxide.

### Step 2: Analyzing the Options
1. **Acetone (CH3COCH3)**: This is a ketone and does have a methyl group adjacent to the carbonyl. It would give a positive haloform test but does not give a positive Fehling's test since it is a ketone.

2. **Acetaldehyde (CH3CHO)**: This is an aldehyde and has an alpha-methyl group. It will give a positive haloform test due to the presence of the methyl group adjacent to the carbonyl. It will also give a positive Fehling's test because it is an aldehyde.

3. **Formaldehyde (HCHO)**: This is also an aldehyde but does not have an alpha-methyl group. It will give a positive Fehling's test but not a haloform test.

4. **Diethyl Ether (C2H5)2O**: This is an ether and does not contain a carbonyl group. It will not give either test.

### Step 3: Conclusion
Based on the analysis:
- **Acetaldehyde (CH3CHO)** is the only compound that gives both a positive haloform test and a positive Fehling's test.

Thus, the answer is **Acetaldehyde**.

---