In which of the following reactions correct major product has be mentioned?

Options

A.
B.
C.
D.

Answer

To solve the question regarding which reactions have the correct major product mentioned, we will analyze each option provided in the question step by step.

### Step 1: Analyze Reaction A
- **Reaction**: Benzene + N-propyl alcohol in presence of H2SO4.
- **Mechanism**:
1. H2SO4 protonates the N-propyl alcohol, creating a positive charge on the oxygen.
2. Water is eliminated, forming an N-propyl carbonium ion (a primary carbonium ion).
3. The primary carbonium ion rearranges to form a more stable secondary carbonium ion.
4. The secondary carbonium ion then acts as an electrophile and attacks the benzene ring.
- **Product**: The final product is an alkylated benzene with the N-propyl group attached.
- **Conclusion**: This reaction is correct.

### Step 2: Analyze Reaction B
- **Reaction**: Nitration of benzene using HNO3 and H2SO4.
- **Mechanism**:
1. HNO3 and H2SO4 generate the nitronium ion (NO2+), which is the electrophile.
2. The nitronium ion attacks the benzene ring.
- **Product**: The expected product is nitrobenzene (C6H5NO2).
- **Conclusion**: The product structure mentioned is incorrect as it does not accurately represent the bonding in nitrobenzene. Thus, this reaction is incorrect.

### Step 3: Analyze Reaction C
- **Reaction**: Sulfonation of benzene.
- **Mechanism**:
1. Two molecules of H2SO4 react to produce SO3 and H3O+.
2. SO3 acts as the electrophile and attacks the benzene ring.
- **Product**: The final product is benzene sulfonic acid (C6H5SO3H).
- **Conclusion**: This reaction is correct.

### Step 4: Analyze Reaction D
- **Reaction**: Friedel-Crafts acylation using CH3CH2C(=O)Cl and AlCl3.
- **Mechanism**:
1. The acyl chloride reacts with AlCl3 to generate the acylium ion (CH3CH2C+=O).
2. The acylium ion acts as an electrophile and attacks the benzene ring.
- **Product**: The final product is an aryl ketone.
- **Conclusion**: This reaction is also correct.

### Final Conclusion
The reactions that have the correct major product mentioned are:
- **A**: Correct
- **B**: Incorrect
- **C**: Correct
- **D**: Correct

Thus, the correct options are A, C, and D.

---