Which of the following organic compounds answers to both iodoform test and Fehling's test?

Options

A. Ethanol
B. Methanal
C. Ethanal
D. Propanone

Answer

To solve the question of which organic compound gives positive results for both the iodoform test and Fehling's test, we can follow these steps:

### Step 1: Understand the Tests
- **Iodoform Test**: This test is used to identify methyl ketones (compounds with the structure RCOCH3) and some alcohols that have a methyl group adjacent to the carbonyl group. A positive result is indicated by the formation of a yellow precipitate of iodoform (CHI3).

- **Fehling's Test**: This test is used to detect the presence of aldehydes. A positive result is indicated by the formation of a red precipitate of copper(I) oxide (Cu2O) when an aldehyde is oxidized.

### Step 2: Analyze Each Compound
We need to analyze the given organic compounds to see which one can give positive results for both tests.

1. **Ethanol (C2H5OH)**:
- **Iodoform Test**: Ethanol has an alpha methyl group (the CH3 group next to the hydroxyl group), so it will give a positive iodoform test.
- **Fehling's Test**: Ethanol can be oxidized to acetaldehyde (an aldehyde), which will give a positive Fehling's test.
- **Conclusion**: Ethanol gives positive results for both tests.

2. **Methanol (CH3OH)**:
- **Iodoform Test**: Methanol does not have a methyl ketone structure, so it will not give a positive iodoform test.
- **Fehling's Test**: Methanol is not an aldehyde, so it will also not give a positive Fehling's test.
- **Conclusion**: Methanol does not give positive results for either test.

3. **Acetaldehyde (C2H4O)**:
- **Iodoform Test**: Acetaldehyde can give a positive iodoform test since it has the structure that fits the criteria.
- **Fehling's Test**: Acetaldehyde is an aldehyde and will give a positive Fehling's test.
- **Conclusion**: Acetaldehyde gives positive results for both tests.

4. **Propanone (C3H6O)**:
- **Iodoform Test**: Propanone (acetone) is a methyl ketone and will give a positive iodoform test.
- **Fehling's Test**: However, propanone does not have an aldehyde functional group, so it will not give a positive Fehling's test.
- **Conclusion**: Propanone only gives a positive iodoform test.

### Step 3: Final Conclusion
Based on the analysis, the only compound that gives positive results for both the iodoform test and Fehling's test is **Ethanol**.

### Answer
**Ethanol (C2H5OH)** is the correct answer.

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