OCR A Jun 2015 Paper 2 Q4

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This question is about the compounds shown below. Cl Cl Cl Cl (cid:37) (cid:40) Cl Cl Cl Cl Cl Cl (cid:38) Cl Cl (cid:41) Cl (cid:39) Cl Cl (cid:42) CH3 Cl CH3 Cl CH3 Cl CH3 H CH3 H CH3 (cid:43) (a) Which compound, B to H, could be used to make the polymer PTFE?[1] (b) Polymer H can be disposed of by combustion. One environmental problem is the production of toxic gases, such as CO. (i) Draw the structure of the monomer needed to produce polymer H. (ii) Give the formula of an acidic toxic gas that could form during combustion of polymer H.[1] [1]OCR 2015<br /> (c) Compound G was once used as a propellant in aerosols. Compound G has been linked with depletion of the ozone layer in the stratosphere. (i) State two properties that made compound G suitable for use as an aerosol. 12[1] (ii) Explain the following statements, using equations where appropriate. Life on Earth benefits from the presence of an ozone layer. The concentration of ozone is maintained in the ozone layer.Compound G produces radicals which catalyse the breakdown of ozone.[5] (iii) Alternative ozone-friendly compounds are now used as propellants instead of compound G. Which compound, B to H, might be suitable as an ozone-friendly propellant?[1]OCR 2015 Turn over<br /> (d) Compounds C and F can be analysed to obtain infrared and mass spectra. 10 Cl Cl Cl Cl Cl (cid:38) Cl Cl Cl (cid:41) (i) What happens to molecules when infrared radiation is absorbed?[1] (ii) Suggest the molecular formulae of two ions responsible for peaks in the mass spectrum of C that are not in the mass spectrum of F.[2] [Total: 13]OCR 2015<br /> 11 BLANK PAGE Question 5 starts on page 12 PLEASE DO NOT WRITE ON THIS PAGEOCR 2015 Turn over<br />

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