`C_(2)H_(6)overset(450^(@)C)rarrC_(2)H_(4)+H_(2)`. Above reaction is called is

Options

A. Combustion
B. Rearrangement
C. Pyrolysis
D. Cleavage

Answer

To solve the question regarding the reaction of ethane (C₂H₆) at high temperature, we can break down the process step by step.

### Step-by-Step Solution:

1. **Identify the Reaction**: The given reaction is:
\[ C_2H_6 \overset{450^\circ C}{\rightarrow} C_2H_4 + H_2 \]
This indicates that ethane (C₂H₆) is being converted into ethylene (C₂H₄) and hydrogen gas (H₂) upon heating.

2. **Understanding the Type of Reaction**: The reaction involves the breakdown of a saturated hydrocarbon (ethane) into an unsaturated hydrocarbon (ethylene) and hydrogen. This type of reaction typically occurs at high temperatures.

3. **Define the Term**: The process of breaking down a larger hydrocarbon into smaller ones, especially when it involves the formation of unsaturated compounds, is known as **pyrolysis**.

4. **Justification**: In this case, since ethane is heated to a high temperature (450°C) and converts into ethylene (an unsaturated hydrocarbon) along with the release of hydrogen gas, it fits the definition of pyrolysis. Pyrolysis is characterized by the thermal decomposition of materials at elevated temperatures in the absence of oxygen.

5. **Conclusion**: Therefore, the reaction of ethane at 450°C to produce ethylene and hydrogen is called **pyrolysis**.

### Final Answer:
The reaction is called **pyrolysis**.

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