AQA AS Chemistry Paper 2 June 2025 | 7404/2 Mark Scheme

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AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
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Tuesday 20 May 2025
v v v Morning Time allowed: 1 hour 30 minutes
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Materials
Forvthisvpapervyouvmustvhave:
 thevPeriodicvTable/DatavSheet,vprovidedvasvanvinsertv(enclosed) ForvExaminer’svUse
 avrulervwithvmillimetrevmeasurements Question Mark
 avscientificvcalculator,vwhichvyouvarevexpectedvtovusevwherevappropriate.
1

Instructions 2
 Usevblackvinkvorvblackvball-pointvpen. 3
 Fillvinvthevboxesvatvthevtopvofvthisvpage. 4
 Answervallvquestions.
5
 Youvmustvanswervthevquestionsvinvthevspacesvprovided.v Dovnotvwritevoutsidevt
hevboxvaroundveachvpagevorvonvblankvpages. 6
 Ifvyouvneedvextravspacevforvyourvanswer(s),vusevthevlinedvpagesvatvthevendvofvt 7
hisvbook.v Writevthevquestionvnumbervagainstvyourvanswer(s).
SectionvB
 Allvworkingvmustvbevshown.
 Dovallvroughvworkvinvthisvbook.v Crossvthroughvanyvworkvyouvdovnotv TOTAL
wantvtovbevmarked.

Information
 Thevmarksvforvquestionsvarevshownvinvbrackets.
 Thevmaximumvmarkvforvthisvpapervisv80.

Advice
 Youvarevadvisedvtovspendv65vminutesvonvSectionvAvandv25vminutesvonvSectionvB.




IB/M/Jun25/G4002/V7 7404/2

, 2
Dovnotvwrit
ev outsidevt
SectionvA hev box


Answervallvquestionsvinvthisvsection.


0 1 Thisvquestionvisvaboutvhalogenoalkanes.
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0 1v .v 1 Halogenoalkanesvundergovsubstitutionvreactionsvwithvnucleophilesvsuchvasv
CN–,vNH3v andvOH–

Explainvwhyvhalogenoalkanesvreactvwithvnucleophiles.
[2vmarks]




0 1v .v 2 2-

BromobutanevreactsvwithvammoniavtovformvCH3CH(NH2)CH2CH3v C
[3vmarks]
ompletevthevmechanismvforvthisvreaction.




2-BromobutanevreactsvwithvKOHvtovgivevavmixturevofvproducts.


0 1v .v 3 Identifyvthevsolventvthatvshouldvbevusedvtovensurevthatvbutan-2-
olvisvthevmainvorganicvproductvwhenv2-brombutanevreactsvwithvKOH
[1vmark]

,IB/M/Jun
25/7404/2

, 3
Dovnotvwrit
ev outsidevt
0 1 .v 4 Undervdifferentvconditions,v2-bromobutanevreactsvwithvKOHvtovformvbut-1- hev box

enevandvtwovothervalkenes.

Namevandvcompletevthevmechanismvtovformvbut-1-enevfromv2-bromobutane.

Identifyvthevothervtwovalkenesvformed.
[5vmarks]

Namevofvmechanismv

Mechanism




Othervalkenev1




Othervalkenev2




0 1 .v 5
Thevcarbocationv(CH3)3C+visvformedvasvanvintermediatevinvthevreacti
onvofv2-bromo-2-methylpropanevwithvKCN

SuggestvthevvaluevofvthevbondvanglevaroundvthevcentralvCvatomvinvthev(C
H3)3C+vcarbocation.
[1vmark]




Questionv1vcontinuesvonvthevnextvpage




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