Which of the following species are involved in the carbylamine test?

Options

A. R-NC
B. `CHCl_(3)`
C. `COCl_(2)`
D. `NaNO_(2) + HCl`

Answer

To determine which species are involved in the Carbylamine test, we need to understand the test's purpose and the reaction mechanism.

### Step-by-Step Solution:

1. **Understanding the Carbylamine Test**:
- The Carbylamine test is specifically used to detect the presence of primary amines. It is a qualitative test that helps identify compounds containing a primary amine functional group.

**Hint**: Remember that the Carbylamine test is specific for primary amines.

2. **Reagents Used in the Test**:
- The primary reagents involved in the Carbylamine test are:
- A primary amine (RNH2)
- A halogenated compound, typically chloroform (CHCl3) or methyl iodide (CH3I).

**Hint**: Identify the reagents that react with primary amines in the Carbylamine test.

3. **Reaction Mechanism**:
- When a primary amine reacts with chloroform (or another halogenated compound), it forms an isocyanide (carbylamine) and releases a molecule of hydrogen halide (HX) and water (H2O).
- The general reaction can be represented as:
\[ RNH2 + CHCl3 \rightarrow RNC + HCl + H2O \]
- Here, RNC is the isocyanide formed from the reaction.

**Hint**: Focus on the products formed during the reaction, which include isocyanide and a halogen acid.

4. **Conclusion**:
- Therefore, the species involved in the Carbylamine test are:
- The primary amine (RNH2)
- Chloroform (CHCl3) or another halogenated compound.

**Hint**: Conclude by summarizing the key reactants and the product formed in the Carbylamine test.

### Final Answer:
The species involved in the Carbylamine test are:
1. Primary amine (RNH2)
2. Chloroform (CHCl3) or a similar halogenated compound.