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Learning objective

Explain elimination of water from alcohols to form alkenes.

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Topic

Alcohols

Subtopic

Alcohol production and reactions

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Explain elimination of water from alcohols to form alkenes

  • This point belongs to Alcohols, especially Alcohol production and reactions.
  • You need to be able to explain elimination of water from alcohols to form alkenes.
  • The key ideas to know are alcohol and elimination.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

alcoholelimination

Why it matters

This objective helps connect Alcohol production and reactions to exam-style questions, flashcards, and revision notes for Alcohols.

Quick student answer

What is the main product formed when ethanol undergoes dehydration?

Direct answer

Ethene is the main product formed when ethanol undergoes dehydration.

Key terms

  • E1 mechanism: A two-step elimination mechanism involving the formation of a carbocation intermediate followed by deprotonation.
  • E2 mechanism: A one-step elimination mechanism where the base abstracts a proton while the leaving group departs simultaneously.

Common trap

Confusing E1 and E2 mechanisms: Remember that E1 involves a carbocation intermediate, while E2 is a concerted reaction.

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