Which of the following gives aldol condensation reaction

Options

A. `C_(6)H_(5)`OH
B. `C_(6)H_(5) - overset(O)overset(||)(C ) - C_(6)H_(5)`
C. `CH_(3) CH_(2) - overset(O)overset(||)(C ) - CH_(3)`
D. `(CH_(3))_(2) C - overset(O)overset(||)(C ) - CH_(3)`

Explanation

To determine which compound gives an aldol condensation reaction, we need to follow these steps:

### Step 1: Understand Aldol Condensation
Aldol condensation is a reaction that occurs between aldehydes or ketones that possess at least one alpha hydrogen atom. An alpha hydrogen is a hydrogen atom that is attached to the carbon atom adjacent to the carbonyl group (C=O).

### Step 2: Analyze the Options
We need to evaluate each option provided to see if it meets the criteria for aldol condensation.

1. **Option 1: Phenol (C6H5OH)**
- Phenol is neither an aldehyde nor a ketone. Therefore, it cannot undergo aldol condensation.

2. **Option 2: C6H5CHO (Benzaldehyde)**
- Benzaldehyde has no alpha hydrogen because it is a benzaldehyde (an aromatic aldehyde). Thus, it cannot undergo aldol condensation.

3. **Option 3: C6H5COCH3 (Acetophenone)**
- Acetophenone has an alpha carbon (the carbon next to the carbonyl group) with one alpha hydrogen (the methyl group, CH3). Therefore, it can undergo aldol condensation.

4. **Option 4: CH3COCH3 (Acetone)**
- Acetone also has an alpha carbon with two alpha hydrogens (the two methyl groups, CH3). Thus, it can also undergo aldol condensation.

### Step 3: Conclusion
The compounds that can undergo aldol condensation from the options given are:
- **Option 3: Acetophenone**
- **Option 4: Acetone**

### Final Answer
Options 3 and 4 give aldol condensation reactions.

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