Edexcel Jan 2016 (IAL) Paper 1 Q21

Answers available below

21 This question is about alkenes. (a) (i) Give the molecular formula of this alkene. (1)(ii) Explain why the alkene in (a)(i) exhibits geometric isomerism. (2)(b) Propene reacts with three different reagents. C=C Reaction KMnO4 /dilute H2SO4 Organic product Reaction 3 HBr H C C C H Br Reaction 1 H C C C H Br OH (i) Give the reagent needed for Reaction 1. (1)20 *P46937A02024* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br /> A E R A S I H T N I E T I R W T O N O D (ii) Identify, by name or formula, the organic product A formed in Reaction 2. (iii) State the colour change that you would see when Reaction 2 is carried out. (1) (1) Fromto(iv) Give the mechanism for Reaction 3. Use curly arrows and show any relevant dipoles and lone pairs. (4) A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P46937A02124* 21 Turn over<br /> (c) But-2-ene polymerizes to form poly(but-2-ene). Draw a section of this polymer, showing two repeat units. (1) 22 *P46937A02224* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br /> (d) Cyclohexanol forms cyclohexene in the following reaction. OH + H2O (i) Calculate the percentage atom economy by mass for the production of cyclohexene. A E R A S I H T N I E T I R W T O N O D (ii) Calculate the percentage yield if 10.20 g of cyclohexanol produced 6.15 g of cyclohexene. A E R A S I H T N (1) (2) I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D (Total for Question 21 = 14 marks) TOTAL FOR SECTION B = 60 MARKS TOTAL FOR PAPER = 80 MARKS *P46937A02324* 23<br />

Show answer