What color change does bromine water undergo when an alkene is present?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What color change does bromine water undergo when an alkene is present?

Explanation:
Bromine water is orange-brown in solution. When an alkene is present, the double bond reacts with bromine in an electrophilic addition, forming a vicinal dibromide. This reaction uses up the Br2, so the orange-brown color disappears and the solution becomes colorless. This decolorization is a classic test for unsaturation. The other color changes don’t occur in this reaction, so they aren’t correct.

Bromine water is orange-brown in solution. When an alkene is present, the double bond reacts with bromine in an electrophilic addition, forming a vicinal dibromide. This reaction uses up the Br2, so the orange-brown color disappears and the solution becomes colorless. This decolorization is a classic test for unsaturation. The other color changes don’t occur in this reaction, so they aren’t correct.

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