Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The test for unsaturated compounds
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State and explain what you would observe when bromine water is added to but-2-ene. Write a chemical equation for the reaction.
Question 2
5 marks · Hard
Answer and see the solution →A student has two unlabelled liquid samples: cyclohexane and cyclohexene. The student wants to identify which is which using bromine water.
(a)[2 marks]Describe how the student should carry out the test with bromine water to distinguish between the two compounds.
(b)[2 marks]Predict and explain what you would observe with each compound after adding bromine water and shaking.
(c)[1 mark]Identify which compound is the alkene. Justify your answer based on your observations.
Question 3
2 marks · Hard
Answer and see the solution →Give the structural formula of the product formed when hex-2-ene reacts with bromine. Name the type of reaction that occurs.