Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :

Answer

To determine the total aldol condensation products (including stereoisomers) formed by the reaction between acetaldehyde and acetophenone, we can follow these steps:

### Step 1: Identify the Reactants
The two reactants are:
- Acetaldehyde (CH₃CHO)
- Acetophenone (C₆H₅COCH₃)

### Step 2: Understand Aldol Condensation
Aldol condensation involves the reaction of two carbonyl compounds in the presence of a base (like sodium hydroxide) to form β-hydroxy carbonyl compounds, which can further dehydrate to form α,β-unsaturated carbonyl compounds.

### Step 3: Self-Aldol Condensation of Acetaldehyde
1. **Self-condensation of acetaldehyde**:
- Acetaldehyde can undergo self-condensation.
- The product formed is 3-hydroxybutanal (β-hydroxybutyraldehyde).
- Upon dehydration, it forms crotonaldehyde (2-butenal).

**Isomers**: This compound can exhibit geometric isomerism (cis/trans) due to the presence of a double bond. Thus, we have:
- **Cis isomer**
- **Trans isomer**

### Step 4: Self-Aldol Condensation of Acetophenone
2. **Self-condensation of acetophenone**:
- Acetophenone can also undergo self-condensation.
- The product formed is 1,3-diphenyl-2-propanone (β-hydroxy ketone).
- Upon dehydration, it forms an α,β-unsaturated ketone.

**Isomers**: This compound can also exhibit E/Z isomerism due to the double bond. Thus, we have:
- **E isomer**
- **Z isomer**

### Step 5: Cross-Aldol Condensation
3. **Cross-condensation between acetaldehyde and acetophenone**:
- Acetaldehyde acts as a nucleophile and acetophenone as an electrophile.
- The product formed is a β-hydroxy ketone.
- Upon dehydration, it forms an α,β-unsaturated ketone.

**Isomers**: This compound can also exhibit E/Z isomerism due to the double bond. Thus, we have:
- **E isomer**
- **Z isomer**

### Step 6: Count the Total Products
Now, we can summarize the products:
- From self-condensation of acetaldehyde: 2 isomers (cis and trans)
- From self-condensation of acetophenone: 2 isomers (E and Z)
- From cross-condensation (acetaldehyde + acetophenone): 2 isomers (E and Z)
- From cross-condensation (acetophenone + acetaldehyde): 2 isomers (E and Z)

### Final Count
Total aldol condensation products including stereoisomers:
- 2 (from acetaldehyde self-condensation)
- 2 (from acetophenone self-condensation)
- 2 (from cross-condensation with acetaldehyde as nucleophile)
- 2 (from cross-condensation with acetophenone as nucleophile)

**Total = 2 + 2 + 2 + 2 = 8 products**

### Conclusion
The total aldol condensation products formed by the reaction between acetaldehyde and acetophenone, including stereoisomers, is **8**.

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