AQA Jan 2011 Paper 4 Q6

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section b answer all questions in the spaces provided do not write outside the box many synthetic routes need chemists to increase the number of carbon atoms in a molecule by forming new carbon carbon bonds this can be achieved in several ways including reaction of an aromatic compound with an acyl chloride reaction of an aldehyde with hydrogen cyanide a consider the reaction of benzene with ch ch cocl a i write an equation for this reaction and name the organic product identify the catalyst required in this reaction write equations to show how the catalyst is used to form a reactive intermediate and how the catalyst is reformed at the end of the reaction marks extra space wmp jan chem do not write outside the box a ii name and outline a mechanism for the reaction of benzene with this reactive intermediate marks extra space question continues on the next page turn over wmp jan chem do not write outside the box b consider the reaction of propanal with hcn b i write an equation for the reaction of propanal with hcn and name the product marks extra space b ii name and outline a mechanism for the reaction of propanal with hcn marks extra space wmp jan chem do not write outside the box b iii the rate determining step in the mechanism in part b ii involves attack by the nucleophile suggest how the rate of reaction of propanone with hcn would compare with the rate of reaction of propanal with hcn explain your answer marks extra space turn over for the next question turn over wmp jan chem

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