One mole of______ undergoes combustion giving 2 moles `CO_2`, 2 moles `H_2O` and heat. (ethane/ethene/ethyne)

Explanation

To solve the question, we need to determine which of the given compounds (ethane, ethene, or ethyne) undergoes combustion to produce 2 moles of CO2 and 2 moles of H2O.

### Step-by-Step Solution:

1. **Understanding Combustion**:
Combustion is a chemical reaction that typically involves a hydrocarbon reacting with oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and heat.

2. **Analyzing Ethane (C2H6)**:
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