AQA Jan 2010 Paper 2 Q7 (with explained solutions) |

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AQA Jan 2010 Paper 2 Q7

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areas outside the box will not be scanned for marking a consider the following reaction ch c ch koh ch c ch kbr br oh a i name and outline a mechanism for this reaction name of mechanism mechanism marks a ii name the haloalkane in this reaction mark a iii identify the characteristic of the haloalkane molecule that enables it to undergo this type of reaction mark wmp jan chem areas outside the box will not be scanned for marking b an alternative reaction can occur between this haloalkane and potassium hydroxide as shown by the following equation ch c ch koh ch c ch kbr h o br name and outline a mechanism for this reaction name of mechanism mechanism marks c give one condition needed to favour the reaction shown in part b rather than that shown in part a mark d alkenes can be polymerised to produce poly alkenes d i state the type of polymerisation that alkenes undergo mark d ii name the alkene that gives a polymer with the repeating unit shown below ch c ch name of alkene mark turn over wmp jan chem

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part sub part i marking guidance nucleophilic substitution m must show an arrow from the lone pair of electrons on the oxygen atom of the negatively charged hydroxide ion to the central c atom m must show the movement of a pair of electrons from the c br bond to the br atom mark m independently award full marks for an sn mechanism in which m is the attack of the hydroxide ion on the intermediate carbocation bromopropane only polar c br or polar carbon bromine bond or dipole on c br or c atom of carbon bromine bond is electron deficient or c br credit carbon halogen bond as an alternative to carbon bromine bond a a ii iii chem aqa gce chemistry mark scheme january series mark comments penalise m if covalent koh is used penalise m for formal charge on c or incorrect partial charges penalise once only for a line and two dots to show a bond max mark for the mechanism for the wrong reactant and or sticks ignore product it must be clear that the discussion is about the carbon atom of the c br bond not just reference to a polar molecule ignore x for halogen chem aqa gce chemistry mark scheme january series elimination m must show an arrow from the lone pair on oxygen of a negatively charged hydroxide ion to the correct h atom m must show an arrow from the correct c h bond to the c c bond and should only be awarded if an attempt has been made at m m is independent award full marks for an e mechanism in which m is on the correct carbocation any one condition from this list to favour elimination alcohol ic ethanol ic solvent high concentration of koh alkali hydroxide or concentrated koh hydroxide high temperature or hot or heat under reflux or t to oc ii addition polymerisation only but ene only hyphens not essential credit base elimination but not nucleophilic elimination no other prefix mechanism penalise m if covalent koh penalise m for formal charge on c or incorrect partial charges penalise once only for a line and two dots to show a bond max marks for the mechanism for wrong reactant and or sticks ignore product apply the list principle ignore aqueous ignore excess penalise additional ignore references to cis and trans or e z ignore butene

Question 1 2 3 4 5 6 7 8 9 10

Topics to revise

AQA > Organic Chemistry > Halogenoalkanes AS >

1 Nucleophilic substitution

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Organic Chemistry > Introduction to organic chemistry AS >

2 Naming organic chemicals

AQA > Organic Chemistry > Alkenes AS >

3 Electrophilic addition

AQA > Organic Chemistry > Optical isomerism >

1 Optical isomerism

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