4 2 This question is about alkenes. (a) Which of these has the molecular formula C6H10? (1) A B C D (b) What is the systematic name of this alkene? H2C C CH3 CH3 HC CH3 (1) A 2-methylpent-1-ene B 3-methylpent-1-ene C 2,3-dimethylbut-1-ene D 2,3-dimethylbut-3-ene 5 Turn over (c) Two reactions of ethene are shown. H C C OH H H H H C C H H H H Reaction 1 Reaction 2 HBr Product Complete the table. (3) Reaction Reagent and condition Product 1 HBr at room temperature 2 H C C OH H H H H 6 (d) But-1-ene has the structure C C H CH2CH3 H H (i) Draw the structure of the polymer formed when but-1-ene polymerises. Include two repeat units. (1) (ii) Calculate the number of molecules in 70.0 g of but-1-ene. [Avogadro constant = 6.02 × 1023 mol−1] (2) (Total for Question 2 = 8 marks) 7 Turn over BLANK PAGE