AQA Jun 2011 Paper 4 Q4

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do not write outside the box the amide or peptide link is found in synthetic polyamides and also in naturally occurring proteins a i draw the repeating unit of the polyamide formed by the reaction of propanedioic acid with hexane diamine a ii in terms of the intermolecular forces between the polymer chains explain why polyamides can be made into fibres suitable for use in sewing and weaving whereas polyalkenes usually produce fibres that are too weak for this purpose marks marks extra space wmp jun chem do not write outside the box b i name and outline a mechanism for the reaction of ch ch cocl with ch nh name of mechanism mechanism b ii give the name of the product containing an amide linkage that is formed in the reaction in part b i mark c the dipeptide shown below is formed from two different amino acids marks ch cooh h n c c n c ch sh h o h h draw the structure of the alternative dipeptide that could be formed by these two amino acids question continues on the next page mark turn over wmp jun chem d the amino acids serine and aspartic acid are shown below do not write outside the box ch oh cooh h c cooh h c ch cooh nh serine nh aspartic acid d i give the iupac name of serine mark d ii draw the structure of the species formed when aspartic acid reacts with aqueous sodium hydroxide d iii draw the structure of the species formed when serine reacts with dilute hydrochloric acid mark mark d iv draw the structure of the species formed when serine reacts with an excess of bromomethane mark wmp jun chem

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