Edexcel Jun 2016 (IAL) Paper 5 Q

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22 The drug 3,4-dihydroxyphenylalanine, L-DOPA, is used in the treatment of Parkinsons disease. HO HO OH NH2 (a) Give the molecular formula for L-DOPA. (1)D O N O T W R I T E I N T H I S A R E A (b) Suggest the organic product of the reaction between L-DOPA and excess ethanoyl chloride. (1) D O N O T W R I T E I N T H I S A R E A (c) Give a chemical reaction and its result that can be used to show the presence of the carboxylic acid group in L-DOPA. (2) D O N O T W R I T E I22 *P46665A02232* N T H I S A R E A<br /> (d) Molecules of L-DOPA can polymerize to form a polyamide by condensation. Draw two repeat units of the polyamide formed from L-DOPA. (2) (Total for Question 22 = 6 marks) TOTAL FOR SECTION B = 51 MARKS A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P46665A02332* 23 Turn over<br />

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