Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline?

Options

A.
B.
C.
D.

Answer

To solve the question regarding the Carbylamine test with aniline, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Carbylamine Test**:
The Carbylamine test is a qualitative test used to detect the presence of primary amines. When a primary amine reacts with chloroform (CHCl3) in the presence of a strong base like potassium hydroxide (KOH), it produces isocyanides (also known as carbylamines), which are characterized by their foul smell.

2. **Identify Aniline**:
Aniline (C6H5NH2) is a primary amine because it has one amino group (-NH2) attached to a carbon atom that is part of an aromatic ring (the phenyl group).

3. **Perform the Reaction**:
When aniline is treated with chloroform and KOH, the reaction proceeds as follows:
- The KOH deprotonates the amine (aniline), making it a better nucleophile.
- The aniline then reacts with chloroform to form an isocyanide.

4. **Product Formation**:
The product formed from this reaction is an isocyanide (also known as carbylamine). The general structure of isocyanide is R-N≡C, where R is the alkyl or aryl group from the amine. In this case, R would be the phenyl group from aniline.

5. **Identify the Correct Answer**:
The question asks for the compound formed when the Carbylamine test is performed with aniline. The product is an isocyanide, which is characterized by its foul smell. Therefore, the correct answer is the isocyanide derived from aniline.

### Conclusion:
The compound formed when the Carbylamine test is performed with aniline is **isocyanide (carbylamine)**.