Aldol condensation would not occur in

Options

A. `CH_(3) "COCH"_(3)`
B. `CH_(3)CH_(2)`CHO
C. HCHO
D. `CH_(3)`CHO

Explanation

To determine in which case aldol condensation would not occur, we need to analyze the presence of alpha hydrogens in the given compounds. Aldol condensation requires at least one alpha hydrogen on the carbon adjacent to the carbonyl group (C=O). Let's evaluate each option step by step.

### Step-by-Step Solution:

1. **Understanding Aldol Condensation**:
- Aldol condensation is a reaction between aldehydes or ketones that have at least one alpha hydrogen. The alpha hydrogen is the hydrogen atom attached to the carbon atom adjacent to the carbonyl (C=O) group.

2. **Identifying Alpha Hydrogens**:
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