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What change occurs when ethene is formed from ethanol?

Answer and explanation

Correct answer: Removal of water

When ethanol is heated with concentrated sulphuric acid at about 443 K, it undergoes dehydration: C₂H₅OH → C₂H₄ + H₂O. The hydroxyl group and a hydrogen atom are removed together as water, producing the C=C bond of ethene. This is not hydrogen addition, carbon removal, or salt formation. Therefore, option A correctly identifies the change.

Related tags

EthanolEtheneDehydrationHydrocarbonsCarbon And Its CompoundsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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