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Learning objective

Outline electrophilic addition to alkenes with hydrogen bromide.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Topic

Alkenes

Subtopic

Electrophilic addition

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Outline electrophilic addition to alkenes with hydrogen bromide

  • This point belongs to Alkenes, especially Electrophilic addition.
  • You need to be able to outline electrophilic addition to alkenes with hydrogen bromide.
  • The key ideas to know are hydrogen bromide and electrophilic addition.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

hydrogen bromideelectrophilic addition

Why it matters

This objective helps connect Electrophilic addition to exam-style questions, flashcards, and revision notes for Alkenes.

Quick student answer

Which product is formed when hydrogen bromide adds to propene (CH3-CH=CH2) under standard conditions?

Direct answer

A) 1-bromopropane (Markovnikov product)

Key terms

  • Electrophilic addition: A reaction in which an electrophile adds to a π bond, forming a new σ bond and a carbocation intermediate.
  • Markovnikov rule: A principle stating that in the addition of HX to an alkene, the hydrogen attaches to the carbon with more hydrogen atoms, and the halide attaches to the more substituted carbon.

Common trap

Assuming anti‑Markovnikov addition for HBr: HBr addition follows Markovnikov’s rule because the proton adds to the less substituted carbon, forming a more stable carbocation that is then attacked by Br⁻.

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