AQA Jan 2011 Paper 2 Q7

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do not write outside the box a the reaction of bromine with propane is similar to that of chlorine with methane three steps in the mechanism for the bromination of propane to form bromopropane are shown below step step step br br cid ch ch ch ch ch ch cid br br cid ch ch ch cid hbr ch ch ch br br cid a i name the type of mechanism in this reaction mark a ii give an essential condition for step to occur mark a iii name the type of step illustrated by steps and mark a iv in this mechanism a different type of step occurs in which free radicals combine name this type of step write an equation to show how hexane could be formed from two free radicals in the mechanism of this reaction type of step equation marks a v write an overall equation for the reaction between bromine and propane by the same mechanism to produce octabromopropane c br mark wmp jan chem do not write outside the box b bromine reacts with alkenes even though bromine is a non polar molecule b i explain why bromine molecules react with the double bonds in alkenes marks extra space b ii name the type of mechanism involved in this reaction mark b iii draw the structure of the compound with mr formed when penta diene h c chch ch ch reacts with an excess of bromine c two products are formed when propene reacts with hydrogen bromide draw the structure of the intermediate that leads to the formation of the major product in the reaction of propene with hydrogen bromide give the name of this type of intermediate structure of intermediate mark type of intermediate marks turn over wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jan chem

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