Aqa A-Level Chemistry Amines Questions With Answers

AQA A-LEVEL CHEMISTRY AMINES QUESTIONS
WITH ANSWERS 2025- 2026
What,are,the,four,structures,of,amines?,,,ANS,-1.,Primary,(1°):,RNH2

2.,Secondary,(2°):,R2NH

3.,Tertiary,(3°):,R3N

4.,Quaternary,(4°):,R4N+X-.



Why,is,ETHANOL's,(alcohol),boiling,point,higher,than,ETHYLAMINE's,(amide),despite,the,similar,size,and,
Mr?,,,ANS,-
Both,have,hydrogen,bonding,BUT,the,H,bonding,in,ethanol,is,STRONGER,than,in,ethylamine,as,the,O-
H,bond,is,more,POLAR,than,the,N-H,bond,and,has,potential,for,more,extensive,H,bonding.



What,are,the,2,ways,to,prepare,PRIMARY,aliphatic,amines?,,,ANS,-
1.,Nucleophilic,substitution,of,halogenoalkanes,by,ammonia.

2.,Reduction,of,nitriles.



What,is,the,nucleophilic,substitution,mechanism,with,ammonia,to,produce,primary,aliphatic,amines?,,,AN
S,-Ammonia,first,acts,as,a,nucleophile,then,as,a,base.,

-,Further,substitution,is,possible,,forming,2°,,3°,and,4°,salts.

-,Inhibited,by,XS,NH3,reacting,with,halogenoalkane,before,amine,has,a,chance.



How,are,nitriles,reduced,to,produce,primary,aliphatic,amines?,,,ANS,-
The,nitrile,formed,from,the,nucleophilic,substitution,mechanism,is,reduced,with,4[H],--
>,LiAlH4,or,H2/Ni,at,150°C.



What,are,the,pros,and,cons,of,reducing,nitriles,to,prepare,amines?,,,ANS,-
+,further,substitution,not,possible.

+,only,one,product.

+,method,exists,to,extend,chain,length.

-,only,produces,primary,amines,with,formula,RCH2NH2.