AQA Jun 2010 Paper 4 Q7

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section b answer all questions in the spaces provided do not write outside the box esters have many important commercial uses such as solvents and artificial flavourings in foods esters can be prepared in several ways including the reactions of alcohols with carboxylic acids acid anhydrides acyl chlorides and other esters a ethyl butanoate is used as a pineapple flavouring in sweets and cakes write an equation for the preparation of ethyl butanoate from an acid and an alcohol give a catalyst used for the reaction marks wmp jun chem b butyl ethanoate is used as a solvent in the pharmaceutical industry do not write outside the box write an equation for the preparation of butyl ethanoate from an acid anhydride and an alcohol marks c name and outline a mechanism for the reaction of ch cocl with ch oh to form an ester question continues on the next page marks turn over wmp jun chem do not write outside the box d the ester shown below occurs in vegetable oils write an equation to show the formation of biodiesel from this ester ch oocc h choocc h ch oocc h marks wmp jun chem do not write outside the box e draw the repeating unit of the polyester terylene that is made from benzene dicarboxylic acid and ethane diol although terylene is biodegradeable it is preferable to recycle objects made from terylene give one advantage and one disadvantage of recycling objects made from terylene marks turn over for the next question turn over wmp jun chem

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