AQA Jan 2013 Paper 4 Q7 (with explained solutions) |

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AQA Jan 2013 Paper 4 Q7

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section b answer all questions in the spaces provided do not write outside the box each of the following conversions involves reduction of the starting material a consider the following conversion o n no h n nh identify a reducing agent for this conversion write a balanced equation for the reaction using molecular formulae for the nitrogen containing compounds and h for the reducing agent draw the repeating unit of the polymer formed by the product of this reaction with benzene dicarboxylic acid marks extra space wmp jan chem b consider the following conversion do not write outside the box identify a reducing agent for this conversion state the empirical formula of the product state the bond angle between the carbon atoms in the starting material and the bond angle between the carbon atoms in the product marks question continues on the next page turn over wmp jan chem do not write outside the box c the reducing agent in the following conversion is nabh ch ch h c c o h c ch oh ch ch c i name and outline a mechanism for the reaction name of mechanism mechanism c ii by considering the mechanism of this reaction explain why the product formed is optically inactive marks marks wmp jan chem

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question a mark scheme general certificate of education a level chemistry unit kinetics equilibria and organic chemistry january marking guidance mark comments ignore reference to sn as a catalyst with the acid allow h ni pt but penalise wrong metal but not nabh lialh na c h oh h and h o without correct molecular formula scores out of allow h if h ni used allow conh or cohn or c h mark two halves separately lose each for error in diamine part error in diacid part error in peptide link missing trailing bonds at one or both ends either or both of h or oh on ends ignore n not sn hcl nabh etc allow o o not conc h so nor any hno sn hcl or fe hcl ignore subsequent use of naoh equation must use molecular formulae c h n o h c h n h o b h ni pt but penalise wrong metal ch in benzene o in cyclohexane o or o if only one angle stated without correct qualification no mark awarded mark scheme general certificate of education a level chemistry unit kinetics equilibria and organic chemistry january m not allowed independent of m but allow m for correct attack on c rather than on c o loses m m is for correct structure including minus sign but lone pair is part of m allow c h m and m include lp and curly arrow allow m arrow to h in h o ignore further arrows not just planar molecule not just planar bond without reference to carbonyl c i nucleophilic addition m ch ch c ch m m for lp arrow and h h ch o ch ch c h m oh ch ch c h ch c ii m planar c o bond group m m attack equally likely from either side about product racemic mixture formed or mixture or each enantiomer equally likely

Question 1 2 3 4 5 6 7 8

Topics to revise

AQA > Organic Chemistry > Optical isomerism >

1 Optical isomerism

AQA > Physical chemistry > Energetics and kinetics AS >

5 Kinetics

AQA > Organic Chemistry > Aromatic chemistry >

2 Electrophilic substitution

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

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