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Learning objective

Outline elimination mechanisms for halogenoalkanes.

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Topic

Halogenoalkanes

Subtopic

Elimination

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Outline elimination mechanisms for halogenoalkanes

  • This point belongs to Halogenoalkanes, especially Elimination.
  • You need to be able to outline elimination mechanisms for halogenoalkanes.
  • The key ideas to know are elimination.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

elimination

Why it matters

This objective helps connect Elimination to exam-style questions, flashcards, and revision notes for Halogenoalkanes.

Quick student answer

Which of the following is a characteristic feature of the elimination mechanism for halogenoalkanes?

Direct answer

B. Loss of a halide ion and a hydrogen atom

Key terms

  • E2 mechanism: A bimolecular elimination mechanism where the base removes a proton while the leaving group departs, resulting in the formation of a double bond.
  • Dehydrohalogenation: The elimination reaction that involves the removal of a hydrogen atom and a halogen atom from adjacent carbon atoms, resulting in the formation of an alkene.

Common trap

Confusing elimination with substitution: Remember that elimination results in the formation of a double bond and the loss of two atoms (a halogen and a hydrogen), while substitution replaces one atom with another.

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