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CIE Mar 2016 v2 Paper 2 Q4
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![The following compounds were all found to be components of a sample of petrol. 10 PMT CH3(CH2)2CH3 (CH3)3CCH2CH(CH3)2 H3C (a) (i) Give the molecular formula of compound G. CH3 C OH H3C[1] (ii) Give the empirical formula of compound H.[1] (iii) Draw the skeletal formula of compound J. [1] (b) Write an equation to represent the complete combustion of compound H.[1] (c) Fossil fuels are often contaminated with sulfur. State and explain why supplies of fossil fuels that contain sulfur pose a problem to the environment.[2]UCLES 2016 9701/22/F/M/16<br />
PMT (d) The boiling points of compounds G, H and J are shown below. 11 compound boiling point / C G 0 H 99 J 112 Explain the differences in the boiling points of the three compounds.[4] (e) Compound J can be produced from 2-chloro-3-methylbutane, C5H11Cl. Give the reagent(s) and conditions for this reaction.[1] [Total: 11]UCLES 2016 9701/22/F/M/16 [Turn over<br />](https://learnah.org/wp-content/uploads/2018/08/March_2016_v2_QP_-_Paper_2_CIE_Chemistry_A-level_4-0.jpg)
![Page 6 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMarch 2016 9701 22 Question Answer Mark Total (d) (i) nucleophilic addition [1] [1] PMT (ii) correct dipole on carbonyl curly arrow from lone pair on CN AND from C=O to O correct intermediate curly arrow from lone pair on O to H correct product [1] [1] [1] [1] [1] [5] [17] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [2] (a) (i) C4H10 (ii) C4H9 (iii) (b) C8H18 + 12O28CO2 + 9H2O (c) sulfur dioxide would be produced on combustion (which contributes to) acid rainCambridge International Examinations 2016<br />
Page 7 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMarch 2016 9701 22 Question Answer Mark Total PMT (d) M1 = H has more / greater / stronger van der Waals / intermolecular forces than G / ora M2 = (because) H has more electrons (than G) M3 = J has hydrogen bonding (between molecules) M4 = strong(er) / great(er) forces require AND high / more energy to overcome (e) NaOH(aq) (a) (i) (ii) pent-3-en(e)-2-one OR 3-penten-2-one (iii) red / orange / yellow precipitate / solid [1] [1] [1] [1] [4] [1] [1] [1] [1] [1] [1] [1] [11] [4] [1] [1] [1]Cambridge International Examinations 2016<br />](https://learnah.org/wp-content/uploads/2018/08/March_2016_v2_MS_-_Paper_2_CIE_Chemistry_A-level_4-0.jpg)
