AQA Jun 2015 Paper 4 Q5 (with explained solutions) |

Skip to content

AQA Jun 2015 Paper 4 Q5

Answers available below

consider the following reaction sequence starting from methylbenzene do not write outside the box ch ch ch reaction reaction no nh a name the type of mechanism for reaction mark b compound j is formed by reduction in reaction b i give a reducing agent for this reaction mark b ii write an equation for this reaction use h to represent the reducing agent mark b iii give a use for j mark wmp jun chem do not write outside the box c outline a mechanism for the reaction of bromomethane with an excess of compound j you should represent j as rnh in the mechanism marks d compound k c h ch nh is a structural isomer of j explain why j is a weaker base than k marks turn over wmp jun chem

Show answer

mark scheme a level chemistry chem june marking guidance mark comments question a g b i electrophilic substitution sn hcl or h ni or h pt or fe hcl or zn hcl or sncl hcl both words needed ignore minor misspellings ignore conc or dil with hcl allow dil h so but not conc h so not allow hno or h ignore naoh after sn hcl ignore catalyst allow molecular formulae as structures given c h no h c h n h o qu states use h so penalised h of b ii ch c h no h ch c h nh h o or c h no h c h nh h o b iii making dyes or making quaternary ammonium salts or making cationic surfactants or making hair conditioner or making fabric softener or making detergents m m ch br nh no mark for name of mechanism ch r n h m m m m m m m lone or electron pair on n in j spread delocalised into ring or not delocalised in k less available for protonation or donation in j or in k there is a positive inductive effect electron releasing more available for protonation or donation in k c d mark scheme a level chemistry chem june allow sn m for lone pair on n and arrow to c or mid point of space between n and c m for arrow from bond to br m for structure of protonated secondary amine m for arrow from bond to n or on n for m ignore rnh or nh removing h but penalise br if no mention of lone pair ce if lone pair mentioned but not on n then lose m and mark on ignore negative inductive effect of benzene allow interacts with cloud for m of

Question 1 2 3 4 5 6 7 8 9 10 11

Topics to revise

AQA > Organic Chemistry > Amines >

3 Reactions involving amines

AQA > Organic Chemistry > Aromatic chemistry >

2 Electrophilic substitution

AQA > Physical chemistry > Acid base equilibria >

6 Buffer solutions

AQA > Organic Chemistry > Organic synthesis >

1 Summary of reactions

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

Similar questions

AQA Jan 2012 Paper 4 Q8

AQA Jan 2010 Paper 4 Q6

AQA Jun 2011 Paper 2 Q9

AQA Jan 2010 Paper 4 Q5

AQA Jun 2016 Paper 4 Q3

About us | Need Help? | Feedback

Proudly powered by WordPress | Theme: Sydney by aThemes.