Name the property of ethyne which makes it useful for cutting and welding of steel.

Explanation

**Step-by-Step Solution:**

1. **Identify the Compound**: The compound in question is ethyne, also known as acetylene, which has the chemical formula C2H2. It consists of two carbon atoms and two hydrogen atoms, with a triple bond between the carbon atoms.

2. **Understand the Combustion Reaction**: When ethyne undergoes combustion in the presence of oxygen, it produces carbon dioxide and water, releasing a significant amount of energy due to the strong carbon-carbon triple bond.

3. **Temperature of Combustion**: The combustion of ethyne with oxygen produces an extremely high flame temperature, reaching up to approximately 3100 degrees Celsius. This high temperature is crucial for applications such as cutting and welding.

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