On heating `C_(2)H_(2)` in red hot copper tube, the compound formed is :

Options

A. Ethylene
B. Benzene
C. Ethane
D. Methane

Answer

To solve the question of what compound is formed when `C2H2` (ethyne or acetylene) is heated in a red-hot copper tube, we can follow these steps:

### Step 1: Understand the Reactant
- The compound `C2H2` is known as ethyne or acetylene. It has a triple bond between the two carbon atoms.

### Step 2: Heating in Red-Hot Copper Tube
- When ethyne is heated in a red-hot copper tube, it undergoes a process called pyrolysis or thermal decomposition. The high temperature facilitates the breaking of the triple bond in ethyne.

### Step 3: Formation of Benzene
- As the ethyne molecules are heated, they can react with each other. The breaking of the triple bond allows the carbon atoms to form new bonds.
- Multiple ethyne molecules can combine through a series of reactions, leading to the formation of a cyclic structure.
- This process ultimately leads to the formation of benzene, which has the formula `C6H6`. Benzene consists of six carbon atoms arranged in a ring, with alternating double bonds.

### Step 4: Conclusion
- Therefore, the compound formed when `C2H2` is heated in a red-hot copper tube is benzene.

### Final Answer
- The compound formed is **benzene**.

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