Test for Unsaturation (AQA A-Level Chemistry): Flashcards

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Test for Unsaturation
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Bonds in unsaturated compounds

C=CC=C or C≡CC≡C bonds

Colour of bromine water

Orange-brown

Unsaturated compound + bromine water observation

Decolourises to colourless

Saturated compound + bromine water observation

Remains orange-brown

Mechanism when alkene reacts with bromine

Electrophilic addition

Ion formed when ππ electrons attack Br2Br_2

Bromonium ion (3-membered cyclic)

Product of alkene + bromine reaction

Dibromoalkane

Cyclohexene + bromine water result

Decolourises (has C=CC=C)

Cyclohexane + bromine water result

No change (saturated)

Meaning of bromine water decolourisation

C=CC=C bonds present (unsaturation)

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Halogenoalkanes

Alkenes

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Halogenoalkanes

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Halogenoalkanes

Alkenes

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Explore AQA A-Level Chemistry Exam Questions by Topics

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Alkanes

Halogenoalkanes

Alkenes

Alcohols

Organic Analysis

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