Which of the following will not give carbylamine reaction

Options

A. t-butly amine
B. aniline
C. sec. butylamine
D. N-methyl methanamine

Answer

To determine which of the given compounds will not give a carbylamine reaction, we need to understand the nature of the compounds involved in this reaction. The carbylamine reaction is a test for primary amines, where a primary amine reacts with chloroform (CHCl3) in the presence of a strong base (like alcoholic KOH) to produce isocyanides.

### Step-by-Step Solution:

1. **Understand the Carbylamine Reaction**:
- The carbylamine reaction is specific to primary amines. Secondary and tertiary amines do not give this reaction.
- The reaction involves the formation of isocyanides from primary amines when treated with chloroform and a strong base.

2. **Identify the Types of Amines**:
- **Primary Amine**: Has the structure R-NH2 (e.g., Aniline).
- **Secondary Amine**: Has the structure R2-NH (e.g., N-Methyl Methanamine).
- **Tertiary Amine**: Has the structure R3-N (e.g., Tertiary butyl amine).

3. **Analyze the Options**:
- **Option 1: Tertiary Butyl Amine (C(CH3)3NH2)**: This is a primary amine (NH2 group attached to a tertiary carbon), hence it can give a positive carbylamine reaction.
- **Option 2: Aniline (C6H5NH2)**: This is a primary amine and will give a positive carbylamine reaction.
- **Option 3: Secondary Butyl Amine (C4H9NH)**: This is a secondary amine and will not give a carbylamine reaction.
- **Option 4: N-Methyl Methanamine (CH3NHCH3)**: This is a secondary amine and will not give a carbylamine reaction.

4. **Conclusion**:
- The compounds that will **not** give a carbylamine reaction are the secondary amines. Therefore, both **Option 3 (Secondary Butyl Amine)** and **Option 4 (N-Methyl Methanamine)** will not give the carbylamine reaction.
- However, since the question asks for one option, the best answer is **Option 4: N-Methyl Methanamine**.

### Final Answer:
**N-Methyl Methanamine will not give a carbylamine reaction.**

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