Which of the following would undergo Aldol condensation ?

Options

A.
B.
C.
D.

Explanation

To determine which of the given compounds can undergo aldol condensation, we need to analyze each compound based on the presence of alpha hydrogen atoms. Aldol condensation requires at least two alpha hydrogens on the carbon adjacent to the carbonyl group. Here's the step-by-step solution:

### Step 1: Understand Aldol Condensation Requirements
Aldol condensation requires:
- At least two alpha hydrogens on the carbon adjacent to the carbonyl group.
- A base (e.g., OH⁻) to abstract the alpha hydrogen.
- Heat to promote the condensation reaction.

### Step 2: Analyze Each Compound
Let’s analyze each of the given compounds to check for the presence of alpha hydrogens.

1. **Compound A**:
- Identify the alpha carbons and count the alpha hydrogens.
- There are four alpha hydrogens available.
- **Conclusion**: Compound A can undergo aldol condensation.

2. **Compound B**:
- Identify the alpha carbons and count the alpha hydrogens.
- There are two alpha hydrogens available.
- **Conclusion**: Compound B can undergo aldol condensation.

3. **Compound C**:
- Identify the alpha carbons and count the alpha hydrogens.
- There is only one alpha hydrogen available.
- **Conclusion**: Compound C cannot undergo aldol condensation because it does not meet the requirement of having at least two alpha hydrogens.

4. **Compound D**:
- Identify the alpha carbons and count the alpha hydrogens.
- There are three alpha hydrogens available.
- **Conclusion**: Compound D can undergo aldol condensation.

### Step 3: Final Conclusion
Based on the analysis:
- **Compounds that can undergo aldol condensation**: A, B, and D.
- **Compound that cannot undergo aldol condensation**: C.

### Answer
The compounds that would undergo aldol condensation are **A, B, and D**.

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