Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Unsaturated hydrocarbons
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Explain why alkenes are classified as unsaturated hydrocarbons and describe the significance of the C=C bond in their chemical reactivity.
Question 2
5 marks · Hard
Answer and see the solution →Butene ( C4H8 ) has several isomers.
(a)[2 marks]Draw the displayed formula of the branched-chain isomer of butene.
(b)[1 mark]Draw the displayed formula of one straight-chain isomer of butene where the double bond is at the end of the carbon chain.
(c)[2 marks]Explain why these structures are isomers of each other.
Question 3
2 marks · Hard
Answer and see the solution →State the name and draw the displayed formula of the alkene that has four carbon atoms in a continuous chain with the double bond between the second and third carbon atoms.