For carbylamine reaction, we need hot alc. KOH and

Options

A. any primary amine and chloroform
B. chloroform and silver powder
C. a primary amine and an alkyl halide
D. a mono alkyl amine and trichloromethane

Explanation

To solve the question regarding the requirements for the carbylamine reaction, we will break down the necessary components and the reaction process step by step.

### Step-by-Step Solution:

1. **Understand the Carbylamine Reaction**:
- The carbylamine reaction, also known as the isocyanate test, is specifically used to identify primary amines.

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

3. **Reaction Mechanism**:
- The primary amine reacts with chloroform in the presence of hot alcoholic KOH.
- The KOH acts as a base, facilitating the reaction.

4. **Reaction Equation**:
- The balanced chemical reaction can be represented as:
\[ RNH2 + CHCl3 + KOH \xrightarrow{\text{heat}} R-N=C=O + KCl + H2O \]
- Here, R-N=C=O represents the isocyanate formed, KCl is potassium chloride, and H2O is water.

5. **Final Product**:
- The product formed is an isocyanate (R-N=C=O), which is characterized by its unpleasant smell, confirming the presence of a primary amine.

6. **Conclusion**:
- Therefore, for the carbylamine reaction, the necessary components are:
- A primary amine
- Chloroform
- Hot alcoholic KOH

### Answer:
The correct answer is: **A primary amine and chloroform**.