AQA Jun 2012 Paper 2 Q8

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section b answer all questions in the spaces provided do not write outside the box the reaction of butane diol with butanedioic acid produces the polymer pbs used in biodegradable packaging and disposable cutlery butanedioic acid is produced by two different processes process l aqueous sodium hydroxide reacts with dibromobutane to make butane diol l butane diol is oxidised to butanedioic acid process l glucose reacts with carbon dioxide in the presence of microorganisms to produce butanedioic acid directly l the carbon dioxide used in this process is obtained from a local factory that produces bioethanol a deduce one safety reason and one environmental reason why process is preferred to process marks extra space wmp jun chem do not write outside the box b i name and outline a mechanism for the following reaction that occurs in process brch ch ch ch br naoh brch ch ch ch oh nabr marks question continues on the next page turn over wmp jun chem do not write outside the box b ii the infrared spectra shown are those of three compounds compound a dibromobutane compound b butane diol compound c butanedioic acid identify the compound responsible for each spectrum by writing the correct letter a b or c in the box next to each spectrum you may find it helpful to refer to table on the data sheet transmittance wavenumber cm transmittance wavenumber cm transmittance wavenumber cm marks wmp jun chem do not write outside the box c in the production of bioethanol glucose c h o is converted into a dilute aqueous solution of ethanol and carbon dioxide give the name of this process and state three essential conditions necessary to produce a good yield of ethanol marks extra space d state the class of alcohols to which the diol butane diol belongs identify a suitable reagent or combination of reagents for the conversion of butane diol into butanedioic acid hoocch ch cooh write an equation for this oxidation reaction using o to represent the oxidising agent marks extra space turn over wmp jun chem

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