AQA Jan 2013 Paper 4 Q4

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a the tripeptide shown is formed from the amino acids alanine threonine and lysine do not write outside the box ch choh nh ch c cooh h n ch c c n c n alanine threonine lysine a i draw a separate circle around each of the asymmetric carbon atoms in the tripeptide mark a ii draw the zwitterion of alanine a iii give the iupac name of threonine mark mark a iv draw the species formed by lysine at low ph question continues on the next page mark turn over wmp jan chem do not write outside the box b the repeating unit shown represents a polyester ch ch ch o c ch ch ch c b i name this type of polymer mark b ii give the iupac name for the alcohol used to prepare this polyester mark c the repeating unit shown represents a polyalkene co polymer this co polymer is made from two different alkene monomers h f f c c cf c c i name the type of polymerisation occurring in the formation of this co polymer mark c ii draw the structure of each alkene monomer alkene monomer alkene monomer marks wmp jan chem do not write outside the box d one of the three compounds shown in parts a b and c cannot be broken down by hydrolysis write the letter a b or c to identify this compound and explain why hydrolysis of this compound does not occur compound explanation marks turn over for the next question turn over wmp jan chem

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