AQA Jan 2013 Paper 2 Q7

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do not write outside the box the refrigerant r a used in air conditioners is a mixture of two fluoroalkanes pentafluoroethane and difluoromethane a i the mechanism for the reaction of fluorine with either an alkane or a fluoroalkane is similar to that for the reaction of chlorine with methane name the type of mechanism for the reaction of chlorine with methane mark a ii write equations for the following steps in the mechanism for the reaction of fluorine with fluoromethane ch f to form difluoromethane ch f initiation step first propagation step second propagation step a termination step leading to the formation of difluoroethane marks a iii write an overall equation for the reaction of fluorine with ethane to form pentafluoroethane cf chf by this mechanism mark wmp jan chem do not write outside the box b the refrigerant r a ccl cf cl has been banned because of concerns about ozone depletion give the iupac name for ccl cf cl mark c nitrogen monoxide no catalyses the decomposition of ozone into oxygen c i write the overall equation for this decomposition mark c ii use the overall equation to deduce step in the following mechanism that shows how nitrogen monoxide catalyses this decomposition step step o no o no o no o step mark turn over for the next question turn over wmp jan chem

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