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Alkenes - Hydrohalogenation (DP IB Chemistry: SL)

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Hydrohalogenation of Alkenes

  • Alkenes will react readily with hydrogen halides such as HCl and HBr to produce halogenoalkanes
  • This reaction is known as hydrohalogenation 
  • It is also an electrophilic addition reaction that occurs quickly at room temperature

Hydrohalogenation reactions in alkenes

  • All the hydrogen halides react in this way, but the fastest reaction occurs in the order HI > HBr > HCl due to the increasing bond strength of the hydrogen-halogen bond, so the weakest bond reacts most easily
  • The mechanism of this reaction is part of Higher Level Chemistry and is covered in Section 20

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Stewart

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Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Exam Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.