Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for welding. In your opinion, why cannot we use a mixture of ethyne and air for this purpose?

Explanation

**Step-by-Step Solution:**

1. **Identify the Molecular Formula**: Ethyne, also known as acetylene, has the molecular formula C2H2. This indicates that there are two carbon atoms and two hydrogen atoms in each molecule of ethyne.

2. **Determine the Valency of Atoms**: Carbon has a valency of 4, meaning it can form four bonds. Hydrogen has a valency of 1, meaning it can form one bond.

3. **Draw the Carbon Backbone**: Start by placing the two carbon atoms next to each other. Since ethyne has a triple bond between the two carbon atoms, we will represent this with three lines (bonds) connecting them.

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