AQA Jan 2011 Paper 2 Q8

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do not write outside the box a student read the following passage on the internet haloalkanes contain a polar covalent bond the carbon atom of the polar covalent bond can be attacked by nucleophiles nucleophilic attack enables haloalkanes to undergo substitution reactions a nucleophilic substitution reaction occurs when a haloalkane undergoes hydrolysis the rate of hydrolysis of the haloalkane is influenced by the carbon halogen bond enthalpy a explain the meaning of each of the following terms in the information given above a i nucleophile mark a ii substitution as applied to nucleophilic substitution in a haloalkane mark a iii hydrolysis mark a iv bond enthalpy as applied to a carbon halogen bond mark question continues on the next page turn over wmp jan chem do not write outside the box b outline a mechanism for the nucleophilic substitution reaction in which bromopropane ch chbrch reacts with potassium hydroxide to form propan ol c haloalkanes also undergo elimination reactions to produce alkenes c i outline a mechanism for the elimination reaction in which bromopropane reacts with potassium hydroxide to form propene marks marks wmp jan chem c ii a student obtained the following infrared spectrum for the product from this do not write outside the box elimination reaction transmittance wavenumber cm use information from the infrared spectrum to state and explain how the student deduced that the product was an alkene you may find it helpful to refer to table on the data sheet marks extra space turn over for the next question turn over wmp jan chem

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