Acetylene is prepared industrially by passing electric discharge through graphite electrodes in the atmosphere of

Options

A. Air
B. `N_2`
C. `H_2`
D. `CO_2`

Explanation

To solve the question regarding the industrial preparation of acetylene, we can break down the process into clear steps.

### Step-by-Step Solution:

1. **Understanding Acetylene**:
- Acetylene is a hydrocarbon with the chemical formula C₂H₂. It is also known as ethyne.

2. **Preparation Method**:
- Acetylene is prepared industrially by using a method that involves electric discharge.

3. **Electrodes Used**:
- The electrodes used in this process are made of graphite. Graphite is chosen due to its high conductivity and ability to withstand high temperatures.

4. **Atmosphere Requirement**:
- The electric discharge is passed through the graphite electrodes in a specific atmosphere. The typical atmosphere used for this process is a mixture of hydrocarbons, often in the presence of a limited amount of oxygen.

5. **Chemical Reaction**:
- During the electric discharge, the high energy from the discharge causes the carbon in the graphite to react with the surrounding hydrocarbons or other carbon sources, leading to the formation of acetylene.

6. **Final Product**:
- The end product of this process is acetylene (C₂H₂), which can then be collected and purified for various industrial applications.

### Final Answer:
Acetylene is prepared industrially by passing electric discharge through graphite electrodes in the atmosphere of hydrocarbons.