On heating ethanol with excess of concentrated sulphuric acid at `170^@C` _____is obtained. (ethene/ester)

Explanation

To solve the question, we need to analyze the reaction that occurs when ethanol is heated with concentrated sulfuric acid.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactant is ethanol, which has the chemical formula \( \text{C}_2\text{H}_5\text{OH} \) (or \( \text{CH}_3\text{CH}_2\text{OH} \)).
- The other reactant is concentrated sulfuric acid (\( \text{H}_2\text{SO}_4 \)).

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