Ethanol heated with excess concentrated H₂SO₄ at about 170 °C mainly gives ____.
Correct answer A. Ethene
Explanation
At about 170 °C with excess concentrated sulphuric acid, ethanol undergoes intramolecular dehydration, losing one water molecule per molecule to form ethene, CH₂=CH₂. At lower temperature with excess ethanol, ether forms instead.
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