Which of the following amine will not respond to carbylamine reaction ?

Options

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

Explanation

To determine which amine will not respond to the carbylamine reaction, we need to understand the types of amines and their reactivity in this specific reaction.

### Step-by-Step Solution:

1. **Understand the Carbylamine Reaction**:
- The carbylamine reaction is a test for primary amines. It involves the reaction of a primary amine with chloroform (CHCl3) and a strong base (like KOH) to form an isocyanide (carbylamine), which has a characteristic smell.

2. **Identify the Types of Amines**:
- Amines can be classified into three categories:
- **Primary amines (1°)**: These have one alkyl or aryl group attached to the nitrogen atom (e.g., R-NH2).
- **Secondary amines (2°)**: These have two alkyl or aryl groups attached to the nitrogen atom (e.g., R2-NH).
- **Tertiary amines (3°)**: These have three alkyl or aryl groups attached to the nitrogen atom (e.g., R3-N).

3. **Analyze the Given Options**:
- **Option 1: Ethylamine (CH3CH2NH2)** - This is a primary amine and will respond to the carbylamine reaction.
- **Option 2: An unspecified secondary amine (e.g., CH3CH(NH2)CH3)** - This is a secondary amine and will NOT respond to the carbylamine reaction.
- **Option 3: Another primary amine** - This will also respond to the carbylamine reaction.
- **Option 4: Phenylamine (C6H5NH2)** - This is a primary aromatic amine and will respond to the carbylamine reaction.

4. **Conclusion**:
- The only amine that does not respond to the carbylamine reaction among the given options is the secondary amine (Option 2).

### Final Answer:
The amine that will not respond to the carbylamine reaction is **Option 2 (the secondary amine)**.