BRAINCAKEQualitative Tests for Alkenes
Alkenes contain a carbon−carbon double bond, C=C. The test for this unsaturation is bromine water.
Add a few drops of bromine water to the sample and shake.
• Positive result: the orange bromine water decolourises (turns colourless).
• Negative result: the bromine water stays orange, e.g. with an alkane.
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Key terms in this lesson
- electrophilic addition
- A reaction mechanism in which an electrophile is attracted to and attacks an electron-rich double bond, and a nucleophile then bonds to the resulting carbocation.
More in Chromatography and Qualitative Analysis
- Thin-Layer Chromatography
- Rf Values
- Gas Chromatography
- Retention Times and Peak Areas
- Qualitative Tests for Haloalkanes
- Qualitative Tests for Phenols
- Qualitative Tests for Carbonyls
- Qualitative Tests for Carboxylic Acids
All 10 lessons in Chromatography and Qualitative Analysis · All OCR A-level Organic Chemistry topics