Turn over 3 4 This question is about alkenes with the molecular formula C5H10 . (a) Draw the skeletal formulae of three branched chain alkenes with the molecular formula C5H10 . (3) 4 (b) Which of these compounds would form pent-2-ene only, when reacted with concentrated phosphoric acid, H3PO4? (1) A CH3CH(OH)CH(CH3)2 B CH2(OH)CH2CH2CH2CH3 C CH3CH2CH2CH(OH)CH3 D CH3CH2CH(OH)CH2CH3 (c) Pent-2-ene reacts with hydrogen bromide, HBr, to form two bromoalkanes. Complete the diagram to show the mechanism for the formation of 2-bromopentane in this reaction. Include curly arrows, and relevant lone pairs and dipoles. (4) H Br Turn over 5 (d) A sample of pent-1-ene, with a mass of 1.33 g, is warmed to 60 °C in a sealed container. The volume of the container is 500 cm3. Calculate the pressure inside the container. Include units and give your answer to an appropriate number of significant figures. [Gas constant (R) = 8.31 J mol−1 K−1] (4) (Total for Question 4 = 12 marks)
Get full Socratic AI guidance on this question — free in the Applaa desktop app
Appy Buddy guides you step-by-step toward the answer without giving it away. Type your attempt and get instant, mark-scheme-aware clues that teach you to think like an examiner.
Join Applaa Community
Create your own games, learn AI concepts, program interactive apps, and share with a kid-safe community approved by parents. Free forever on Windows and Mac.
Available for Windows and macOS · COPPA Compliant
Exam Specification Info
This question is part of the UK A-Level Chemistry syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
While Other Kids Get an AI Head Start, Is Yours Falling Behind?
Give your child the same AI app-building, exam prep and tutoring edge — free for the first month, no credit card needed.
Join 10,000+ students building their first AI-powered apps with Applaa