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Learning objective

Explain how carbon-halogen bond enthalpy affects reaction rate.

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Topic

Halogenoalkanes

Subtopic

Nucleophilic substitution

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Explain how carbon-halogen bond enthalpy affects reaction rate

  • This point belongs to Halogenoalkanes, especially Nucleophilic substitution.
  • You need to be able to explain how carbon-halogen bond enthalpy affects reaction rate.
  • The key ideas to know are carbon-halogen bond.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

carbon-halogen bond

Why it matters

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

Quick student answer

Which of the following halogenoalkanes is expected to undergo nucleophilic substitution the fastest?

Direct answer

1-iodopropane

Key terms

  • Nucleophile: A species that donates an electron pair to form a chemical bond in a reaction.
  • Leaving group: An atom or group that can depart from the parent molecule during a substitution reaction.

Common trap

Confusing bond strength with reactivity: Remember that weaker bonds break more easily, leading to faster nucleophilic substitution.

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