Which of the following does not represent the correct product?

Options

A.
B.
C.
D.

Answer

To determine which of the given reactions does not represent the correct product, we will analyze each reaction step by step.

### Step 1: Analyze Reaction A
- **Reactants**: 2-bromo-2,3-dimethylbutan-3 and Ag+
- **Mechanism**: The bromine leaves, forming a carbocation. The methyl group migrates to stabilize the carbocation.
- **Product**: The final product is 3,3-dimethyl-2-butanol or butan-2-ol.
- **Conclusion**: This reaction is correct.

### Step 2: Analyze Reaction B
- **Reactants**: 2,3-butanediol and H+
- **Mechanism**: Protonation of the hydroxyl group leads to the formation of a carbocation after water leaves. The hydrogen from the adjacent carbon migrates.
- **Product**: The final product is butanone.
- **Conclusion**: This reaction is correct.

### Step 3: Analyze Reaction C
- **Reactants**: 2,3-butanediol and H+
- **Mechanism**: Protonation occurs, leading to the formation of a carbocation. The phenyl group migrates to stabilize the carbocation.
- **Product**: The expected product is 3,3-diphenyl-2-butanone.
- **Conclusion**: The product is incorrect because the phenyl group should migrate, but the product does not reflect this correctly.

### Step 4: Analyze Reaction D
- **Reactants**: 3-amino-2,3-dimethyl-butan-2-ol and Na2HCl
- **Mechanism**: The nitrogen lone pair attacks, forming a nitrophonium ion. The nitrogen leaves, forming a carbocation, and a methyl group migrates.
- **Product**: The final product is 3,3-dimethyl-butan-2-one or butan-2-one.
- **Conclusion**: This reaction is correct.

### Final Conclusion
- **Incorrect Product**: Reaction C does not represent the correct product as the migration of the phenyl group is not accurately depicted in the product.

### Answer
The reaction that does not represent the correct product is **C**.

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