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Learning objective

Use bromine water to test for unsaturation.

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Topic

Alkenes

Subtopic

Structure, bonding and reactivity

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Use bromine water to test for unsaturation

  • This point belongs to Alkenes, especially Structure, bonding and reactivity.
  • You need to be able to use bromine water to test for unsaturation.
  • The key ideas to know are test, unsaturation, and bromine.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

testunsaturationbrominewater

Why it matters

This objective helps connect Structure, bonding and reactivity to exam-style questions, flashcards, and revision notes for Alkenes.

Quick student answer

What is the observation when bromine water is added to an alkene?

Direct answer

The solution turns colorless.

Key terms

  • Electrophilic addition: A reaction mechanism where an electrophile reacts with a nucleophile, resulting in the addition of atoms or groups across a double bond.
  • Bromination: The addition of bromine to an alkene, resulting in the formation of a dibrominated compound.

Common trap

Confusing bromine water with iodine solution: Remember that bromine water is brown and turns colorless when reacting with alkenes, while iodine solution remains brown.

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