Which of the following compound doesn’t gives Hoffmann’s carbyl amine test ?

Options

A.
B.
C.
D.

Answer

To determine which compound does not give Hoffmann’s carbylamine test, we need to understand the requirements for this test. The Hoffmann's carbylamine test is specific for primary amines, which react with chloroform and alcoholic KOH to produce isocyanides. Secondary and tertiary amines do not give this test.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- We need to analyze the given compounds to determine whether they are primary, secondary, or tertiary amines.

2. **Examine Each Option**:
- **Option 1**: This compound is a secondary amine. It has only one hydrogen atom attached to the nitrogen atom (NH group), which means it cannot undergo the Hoffmann's carbylamine reaction.
- **Option 2**: This compound is a primary amine (NH2 group). It has two hydrogen atoms attached to the nitrogen atom, which allows it to react and give a positive test.
- **Option 3**: Aniline (C6H5NH2) is also a primary amine. It has an NH2 group attached to a benzene ring and will give a positive test.
- **Option 4**: This compound is also a primary amine (NH2 group) attached to a benzene ring. It will also give a positive test.

3. **Conclusion**:
- From the analysis, we find that **Option 1** is the only compound that does not give the Hoffmann's carbylamine test because it is a secondary amine.

### Final Answer:
**Option 1** does not give Hoffmann’s carbylamine test.