Phenyl isocyanides are prepared by

Options

A. Rosenmund's reaction
B. Carbylamine reaction
C. Reimer-Tiemann reaction
D. Wurtz reaction

Explanation

To prepare phenyl isocyanide, we can utilize the carbylamine reaction. Here’s a step-by-step solution to the question:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The main reactant needed for the carbylamine reaction is aniline (C6H5NH2), which is a primary aromatic amine.
- We also need chloroform (CHCl3) and a strong base, typically potassium hydroxide (KOH).

2. **Set Up the Reaction**:
- In a reaction flask, mix aniline with chloroform and add KOH. The strong base will help deprotonate the aniline, making it a better nucleophile.

3. **Nucleophilic Attack**:
- The deprotonated aniline (anilide) will attack the carbon atom of chloroform. This carbon is electrophilic due to the presence of the three electronegative chlorine atoms.

4. **Formation of Isocyanide**:
- The reaction proceeds through the formation of an intermediate, which eventually leads to the loss of a molecule of HCl and the formation of phenyl isocyanide (C6H5-NC).
- The final product is phenyl isocyanide, which has the structure of a benzene ring attached to an isocyanide group.

5. **Conclusion**:
- The correct method for preparing phenyl isocyanide is through the carbylamine reaction, confirming that option B is the correct answer.