AQA Jan 2010 Paper 4 Q8

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section b answer all questions in the spaces provided areas outside the box will not be scanned for marking three isomers of c h no are shown below no no no no no no a i give the number of peaks in the c n m r spectrum of each isomer marks a ii draw the displayed formula of the compound used as a standard in recording these spectra mark wmp jan chem areas outside the box will not be scanned for marking b isomer x is prepared from nitrobenzene by reaction with a mixture of concentrated nitric acid and concentrated sulfuric acid the two acids react to form an inorganic species that reacts with nitrobenzene to form x b i give the formula of this inorganic species formed from the two acids and write an equation to show its formation marks b ii name and outline a mechanism for the reaction of this inorganic species with nitrobenzene to form x question continues on the next page marks turn over wmp jan chem areas outside the box will not be scanned for marking c isomer y is used in the production of the polymer kevlar y is first reduced to the diamine shown below h n nh c i identify a suitable reagent or mixture of reagents for the reduction of y to form this diamine write an equation for this reaction using h to represent the reducing agent marks c ii this diamine is then reacted with benzene l dicarboxylic acid to form kevlar draw the repeating unit of kevlar marks wmp jan chem c iii kevlar can be used as the inner lining of bicycle tyres the rubber used for the outer part of the tyre is made of polymerised alkenes areas outside the box will not be scanned for marking state the difference in the biodegradability of kevlar compared to that of rubber made of polymerised alkenes use your knowledge of the bonding in these polymer molecules to explain this difference marks extra space turn over for the next question turn over wmp jan chem

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