AQA Jan 2011 Paper 4 Q4

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do not write outside the box a name compound y hoch ch cooh mark b under suitable conditions molecules of y can react with each other to form a polymer b i draw a section of the polymer showing two repeating units mark b ii name the type of polymerisation involved mark c c i when y is heated an elimination reaction occurs in which one molecule of y loses one molecule of water the organic product formed by this reaction has an absorption at cm in its infrared spectrum identify the bond that causes the absorption at cm in its infrared spectrum mark c ii write the displayed formula for the organic product of this elimination reaction c iii the organic product from part c ii can also be polymerised draw the repeating unit of the polymer formed from this organic product mark mark wmp jan chem do not write outside the box d at room temperature aminobutanoic acid exists as a solid draw the structure of the species present in the solid form e the amino acid glutamic acid is shown below mark draw the structure of the organic species formed when glutamic acid reacts with each of the following e i an excess of sodium hydroxide e ii an excess of methanol in the presence of concentrated sulfuric acid e iii ethanoyl chloride question continues on the next page mark mark mark turn over wmp jan chem do not write outside the box f a tripeptide was heated with hydrochloric acid and a mixture of amino acids was formed this mixture was separated by column chromatography outline briefly why chromatography is able to separate a mixture of compounds practical details are not required marks wmp jan chem turn over for the next question do not write on this page answer in the spaces provided turn over wmp jan chem

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