Which of the following amine will give the carbylamine test ?

Options

A.
B.
C.
D.

Answer

To determine which amine will give the carbylamine test, we need to follow these steps:

### Step-by-Step Solution:

1. **Understand the Carbylamine Test**: The carbylamine test is a qualitative test used to identify primary amines. It is based on the reaction of primary amines with chloroform (CHCl3) in the presence of a strong base, typically alcoholic KOH, to produce isocyanides (carbylamines).

2. **Identify the Types of Amines**: Amines can be classified into three categories based on the number of hydrogen atoms attached to the nitrogen atom:
- **Primary amines (1°)**: Have two hydrogen atoms attached to nitrogen (e.g., R-NH2).
- **Secondary amines (2°)**: Have one hydrogen atom and one alkyl group attached to nitrogen (e.g., R1-NH-R2).
- **Tertiary amines (3°)**: Have no hydrogen atoms attached to nitrogen, only alkyl groups (e.g., R1-NR2-R3).

3. **Determine Which Amines React**: The carbylamine test is only positive for primary amines because they have the necessary hydrogen atoms to participate in the reaction. Secondary and tertiary amines do not have the required hydrogen atoms to form isocyanides.

4. **Analyze the Given Options**:
- **Option 1**: Aniline (C6H5NH2) - This is a primary amine and will give a positive carbylamine test.
- **Option 2**: Benzylamine (C6H5NHCH3) - This is a secondary amine and will not give a positive test.
- **Option 3**: Tertiary amine (e.g., N,N-Dimethylamine) - This will not give a positive test.
- **Option 4**: Another secondary or tertiary amine - This will also not give a positive test.

5. **Conclusion**: Based on the analysis, the only amine that will give a positive carbylamine test is **Aniline (Option 1)**.

### Final Answer:
**Aniline (Option 1)** will give the carbylamine test.