Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
11–18 of 18 · Hard
Question 11
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 12
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.
Question 13
2 marks · Hard
Answer and see the solution →Write a balanced chemical equation for the hydration of ethene, and name the product formed.
Question 14
5 marks · Hard
Answer and see the solution →Ethene is an important starting material in the chemical industry.
(a)[2 marks]Write the balanced chemical equation for the hydrogenation of ethene.
(b)[2 marks]Write the balanced chemical equation for the hydration of ethene.
(c)[1 mark]State one use for the product of the hydration reaction.
Question 15
2 marks · Hard
Answer and see the solution →State the type of reaction that occurs when ethene reacts with hydrogen, and name the product formed.
Question 16
7 marks · Hard
Answer and see the solution →This question is about alkenes and their addition reactions.
(a)[2 marks]Explain what is meant by an 'unsaturated hydrocarbon'. Refer to the bonding in your answer.
(b)[2 marks]Ethene reacts with hydrogen gas in the presence of a catalyst. Write a balanced chemical equation for this reaction using molecular formulae.
(c)[3 marks]Hydration is another important addition reaction of ethene. State the name and molecular formula of the organic product formed when ethene reacts with steam. Write a balanced chemical equation for this reaction.
Question 17
7 marks · Hard
Answer and see the solution →This question is about isomerism in alkenes and addition reactions.
(a)[2 marks]Butene (C4H8) has several isomers. Draw and name two different structural isomers of butene (use displayed formulae).
(b)[2 marks]But-1-ene reacts with hydrogen in an addition reaction. Write a balanced chemical equation for this reaction using molecular formulae.
(c)[3 marks]State the name and structural formula of the organic compound formed when but-2-ene reacts with steam.
Question 18
7 marks · Hard
Answer and see the solution →This question is about drawing and naming alkenes and their reactions.
(a)[2 marks]Draw the displayed formula of propene (C3H6). Name the type of bond responsible for its unsaturation.
(b)[2 marks]State the product and write the balanced chemical equation for the reaction between propene and hydrogen gas.
(c)[3 marks]Name the organic product and give its molecular formula when propene reacts with steam in the presence of a catalyst.