Carbylamine reaction is given by

Options

A. `C_(6) H_(5) NHCH_(3)`
B. `CH_(3) NH_(2)`
C. `(CH_(2))_(2) NH`
D. `(CH_(3))_(3)N`

Explanation

### Step-by-Step Solution

1. **Understanding the Carbylamine Reaction**:
The carbylamine reaction involves the reaction of a primary amine with chloroform (CHCl₃) in the presence of alcoholic potassium hydroxide (KOH) and heat. The product formed is an isocyanide (or carbylamine).

2. **Identifying the Reactants**:
The reactants required for the carbylamine reaction are:
- A primary amine (RNH₂)
- Chloroform (CHCl₃)
- Alcoholic potassium hydroxide (KOH)

3. **Mechanism of the Reaction**:
- The hydroxide ion (OH⁻) from KOH abstracts a hydrogen atom from chloroform, forming a dichlorocarbene intermediate (CCl₂).
- This dichlorocarbene is electron-deficient and reacts with the primary amine (RNH₂).
- The nitrogen in the amine donates its lone pair to the electron-deficient carbon, forming a bond.
- Subsequent steps involve the removal of chloride ions (Cl⁻) and the formation of the isocyanide (RNC).

4. **Identifying Primary Amines**:
In order to determine which option gives the carbylamine reaction, we need to identify which of the given amines is a primary amine:
- **Option A**: Contains one aryl group and one alkyl group (secondary amine).
- **Option B**: Contains only one alkyl group (primary amine).
- **Option C**: Contains two alkyl groups (secondary amine).
- **Option D**: Contains three alkyl groups (tertiary amine).

5. **Conclusion**:
The only option that contains a primary amine is **Option B (CH₃NH₂)**. Therefore, this is the correct answer as it will undergo the carbylamine reaction.

### Final Answer:
The carbylamine reaction is given by **Option B: CH₃NH₂ (methylamine)**, which is a primary amine.

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