Edexcel Jun 2014 (R) Paper 1 Q23

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23 This question is about isomers of C4H8. and a (cid:652) bond. (a) (i) Alkenes contain a carbon-carbon double bond, which consists of a (cid:305) bond Show, and clearly label, the (cid:305) and (cid:652) bonds on the diagram below. C C *(ii) Explain why the (cid:305) bond is stronger than the (cid:652) bond. (2) (2)(b) (i) Draw the structural formula of E-but-2-ene. (ii) Explain why but-1-ene does not exhibit E-Z isomerism. (1) (1)*P42990A02528* 25 Turn over<br /> (iii) Describe the result of the test for the presence of a C C bond in E-but-2-ene using bromine water. Give the displayed formula of the organic product. (2) Test resultDisplayed formula of organic product: (c) Another test for C C bonds is the reaction with acidified potassium manganate(VII). Describe the result of this test using but-1-ene and give the displayed formula of the organic product. (2) Test resultDisplayed formula of organic product: 26 *P42990A02628*<br /> (d) Another isomer of C4H8 has the structure shown below. CH2 CCH3 CH3 (i) Name this isomer. (1)(ii) This isomer forms an addition polymer. Show the structure of this polymer by drawing two repeat units. (e) Polybutene is the name used by cosmetic companies for a mixture of poly(but-1-ene) and poly(but-2-ene). An American eco-cosmetics company says that though polybutene is considered a safe ingredient in lip gloss, it is non-sustainable to use it. Suggest one reason to justify this statement. (1) (1)(Total for Question 23 = 13 marks) TOTAL FOR SECTION B = 60 MARKS TOTAL FOR PAPER = 80 MARKS *P42990A02728* 27<br />

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