AQA A2 Chemistry C27 Aromatic Chemistry Kerboodle Answers

This page contains the AQA A2 Chemistry C27 Aromatic Chemistry Questions and kerboodle answers for revision and understanding.This page also contains the link to the notes and video for the revision of this topic.
 
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C27.1 Introduction to arenes AQA A2 Chemistry C27 Aromatic Chemistry Kerboodle Answers : Page No. 176

1 CH

2 3

3 Atoms in the ring rather than being localised in three distinct double bonds.

4

 



27.2 Arenes — physical properties, naming, and reactivity AQA A2 Chemistry C27 Aromatic Chemistry Kerboodle Answers : Page No. 178

 

1 Van der Waals forces

2

a 1,3-dichlorobenzene

b 1-bromo-4-chlorobenzen

3 a 1,4-dimethglbenzene

b 1,2-dimethylbenzene

4

R+

 



27.3 Reactions of arenes AQA A2 Chemistry C27 Aromatic Chemistry Kerboodle Answers : Page No. 182

 

1

a A electrophilic substitution

b A electrophilic substitution

2 1,2-dinitrobenzene and 1,4-dinitrobenzene

3

Addition reactions would involve the loss of aromatic stability.

4

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Practice questions: Page No. 183-185

conc HNO3

conc H2SO4

HNO3 + 2H2SO4 → NO2+ + H3O+ + 2HSO4

2

CH3COCl + AlCl3 → CH3+CO + AlCl4

Electrophilic substitution

3

CH3COCl + AlCl3 → CH3+CO + AlCl4

Electrophilic substitution

4

(a) CH3CO+

(b)

5

(a)

CH3CH2COCl OR CH3CH2CClO OR propanoyl chloride

OR (CH3CH2CO)2O OR propanoic anhydride

Penalize contradiction in formula and name, e.g., propyl chloride

AlCl3 or FeCl3 or names

CH3CH2COCl + AlCl3 → CH3 CH2CO+ + AlCl4

Allow RCOCl in equation but penalise above

(b)

(c)

Tollens or ammoniacal silver nitrate

6 (a)

(

Benzene is more stable than cyclohexatriene

Because of delocalisation or electrons spread out or resonance

B

conc HNO3

conc H2SO4

2 H2SO4 + HNO3 → 2HSO4 + NO2+ + H3O+

 

7

[CH3CH2CO]+

CH3CH2COCl + AlCl3 → [CH3CH2CO]+ + AlCl4_

 

8

(4 marks) AQA. 2004

Cyclohexane evolves 120 kJ mol-1

Therefore expect triene to evolve

360 kJ mol-1;

or 3 × 120 = 360 kJ mol-1

360 – 208 = 152 kJ;

Benzene lower in energy / more stable; due to delocalisation;

9

(a)

Nitric acid and sulfuric acid

(b) Explosives / dyes / fibres / pharmaceuticals

(c) (i)

C6H6 + HNO3 → C6H5NO2 + H2)

(ii) It accepts a pair of electrons

(iii)

Electrophilic substitution.

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