Which of the following give isocyanide test?

Options

A.
B.
C.
D. `(CH_(3))_(2)NH`

Answer

To determine which of the given compounds gives the isocyanide test (also known as the carbamide test), we need to analyze the types of amines presented in the question. The isocyanide test is specific to primary amines.

### Step-by-Step Solution:

1. **Identify the Types of Amines**:
- **Aniline**: This is an aromatic primary amine (C6H5NH2).
- **Aniline with a Methyl Group**: This is also a primary amine (C6H5NH(CH3)).
- **2-Methyl Aniline**: This is another aromatic primary amine (C6H4(CH3)NH2).
- **Aliphatic Secondary Amine**: This is a secondary amine (R2NH), which does not qualify for the isocyanide test.

2. **Understanding the Isocyanide Test**:
- The isocyanide test is performed by reacting the amine with chloroform (CHCl3) in the presence of alcoholic KOH.
- Only primary amines can undergo this reaction to produce isocyanides, which are foul-smelling compounds.

3. **Evaluate Each Compound**:
- **Aniline**: Since it is a primary amine, it will give the isocyanide test.
- **Aniline with a Methyl Group**: This is still a primary amine and will also give the isocyanide test.
- **2-Methyl Aniline**: This is also a primary amine and will give the isocyanide test.
- **Aliphatic Secondary Amine**: This will not give the isocyanide test because it is a secondary amine.

4. **Conclusion**:
- The compounds that give the isocyanide test are **Aniline**, **Aniline with a Methyl Group**, and **2-Methyl Aniline**. The aliphatic secondary amine does not give the test.

### Final Answer:
The compounds that give the isocyanide test are:
- Aniline
- Aniline with a Methyl Group
- 2-Methyl Aniline