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Unformatted text preview: for each of the reactions shown below. N 3 OH Na F OH OTs H 2 /Pt TsCl HO 4a . (6) MECHANISM. Draw a mechanism for the following reaction, showing all intermediates ( 1 mark ), all curly arrows describing electron movement ( 4marks ) and all charges ( 1 mark ) (if applicable). 4b . (6) Use the appropriate chemical equations to evaluate the equilibrium constant describing the proton exchange between sodium ethoxide (NaEtO-) (pKa of EtOH = 16) and H 2 O (pKa of H 2 O =15.7). 5. (5) Stereochemistry . Indicate which of the molecules shown below is chiral (4 marks). Assign the absolute configuration to any one of the stereogenic (chiral) centres (1 mark)....
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