Which of the following species are involved in carbylamine test
(i) RNC (ii) `CHCl_3`
(iii) `COCl_2` (iv) `NaNO_3 +HCl`

Options

A. (i) and (iv)
B. (i) and (ii)
C. (iii) and (iv)
D. (ii) and (iii)

Explanation

To determine which species are involved in the carbylamine test, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Carbylamine Test**:
- The carbylamine test is used to identify primary amines. In this test, a primary amine reacts with chloroform (CHCl₃) and a strong base (commonly potassium hydroxide, KOH) to produce an isocyanide (also known as carbylamine) and a foul-smelling odor.

2. **Analyzing the Options**:
- **(i) RNC**: This represents the product of the carbylamine test, which is an isocyanide. Since it is the end product of the reaction, it is involved in the test.
- **(ii) CHCl₃**: Chloroform is a reactant in the carbylamine test. It is necessary for the reaction to occur, so it is involved.
- **(iii) COCl₂**: This is phosgene, which is not involved in the carbylamine test. It does not participate in the reaction.
- **(iv) NaNO₃ + HCl**: This combination does not play a role in the carbylamine test. It is not involved in the reaction.

3. **Conclusion**:
- The species involved in the carbylamine test are (i) RNC and (ii) CHCl₃. Therefore, the correct answer is option B, which includes these two species.

### Final Answer:
The species involved in the carbylamine test are:
- (i) RNC (Alkyl isocyanide)
- (ii) CHCl₃ (Chloroform)