AQA Jun 2016 Paper 2 Q3

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do not write outside the box a haloalkanes are used as refrigerants solvents and anaesthetics trichloromethane chcl is a haloalkane that can be formed by heating a mixture of chloromethane ch cl and chlorine a i write an overall equation for the formation of trichloromethane by the reaction of chloromethane with chlorine mark a ii name the mechanism for this formation of trichloromethane mark a iii dichloromethane ch cl is an intermediate in this formation of trichloromethane write an equation for each of the following steps in the mechanism for the reaction of dichloromethane with chlorine marks initiation step first propagation step second propagation step a termination step leading to the formation of a compound with formula c h cl wmp jun chem do not write outside the box b chlorotrifluoromethane cclf is used as a refrigerant but is being phased out due to concerns about ozone depletion in the upper atmosphere in the upper atmosphere cclf decomposes in the presence of uv light forming a reactive intermediate that catalyses the decomposition of ozone b i write an equation to show how cclf decomposes to form the reactive intermediate mark b ii write two equations to show how this reactive intermediate is involved in catalysing the decomposition of ozone marks turn over for the next question turn over wmp jun chem

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