Carbylamine is liberated when …….is heated with chloroform and alcoholic potash

Options

A. An aldehyde
B. A primary amine
C. A secondary amine
D. A phenol

Explanation

To solve the question "Carbylamine is liberated when …….is heated with chloroform and alcoholic potash," we need to identify the correct reactant that leads to the formation of carbylamine when reacted with chloroform and alcoholic potassium hydroxide (KOH).

### Step-by-step Solution:

1. **Understanding Carbylamine**:
- Carbylamine, also known as isocyanide, has the structure R-N≡C, where R is an alkyl or aryl group. It is formed from the reaction of a primary amine with chloroform and alcoholic KOH.

2. **Identifying the Reactant**:
- The reaction that produces carbylamine specifically requires a primary amine. This is crucial because secondary and tertiary amines do not undergo this reaction to form carbylamine.

3. **Reaction Conditions**:
- The presence of chloroform (CHCl3) and alcoholic KOH is essential for the reaction. The alcoholic KOH acts as a base, facilitating the deprotonation of the amine, while chloroform provides the carbon source for the isocyanide formation.

4. **Elimination of Other Options**:
- Since only primary amines can react under these conditions to form carbylamine, we can eliminate options that include secondary amines, tertiary amines, aldehydes, or phenols.

5. **Conclusion**:
- Therefore, the correct answer to the question is that carbylamine is liberated when a **primary amine** is heated with chloroform and alcoholic potash.

### Final Answer:
**A primary amine** is heated with chloroform and alcoholic potash to liberate carbylamine.