AQA a level chemistry paper 2 comprehensive Questions and Answers with Verified Solutions

AQA a level chemistry paper 2
comprehensive Questions and Answers
with Verified Solutions
Question 1:
Explain how carbon dioxide causes global warming (2) 1. C=O bonds in
carbon

Answer:
dioxide absorb infrared radiation 2. IR radiation emitted by the earth
doesn't escape from the atmosphere


Question 2:
Give the IUPAC name of CH3CH2CH2CH2CH(OH)CN (1)

Answer:
2-hydroxyhexanenitrile


Question 3:
Describe how you would distinguish between separate samples of the
two isomers of CH3CH2CH2CH2CH(OH)CN (2)
Answer:
1. plane polarised light 2 enantiomers would rotate the plane in opposite
directions

,Question 4:
Explain why the reaction of CH3CH2CH2CH2CHO with KCN followed by
dilute acid produces a racemic mixture (3)

Answer:
1. planar carbonyl group 2. nucleophilic attack from either side 3. with
equal probability


Question 5:
Draw a structural formula for the diester C6H10O4




Answer:



Question 6:
Draw the structure of the zwitterion formed by pheny-

,Answer:
lalanine (1)


Question 7:
Draw the structure of serine at high pH (1)




Answer:



Question 8:
Draw the structures of both dipeptides formed when




Answer:
phenylalanine reacts with serine (2)


Question 9:

, Name and outline a mechanism for the reaction be-




Answer:
tween CH3CH2COCl and CH3CH2NH2, give the IUPAC name of the
organic product (6)


Question 10:
Write an equation for the reaction of conc nitric acid with conc sulphuric
acid to form the species that reacts with nitrobenzene (1)

Answer:
HNO3 + 2H2SO4 -> NO2+ + H3O+ + 2HSO4- (allow H2SO4 + HNO3 ->
NO2+ + HSO4- + H2O)


Question 11:
Name and outline a mechanism for the reaction of




Answer: