PPSC Chemistry Lecturer Preparation (Test # 19)- Malik Xufyan

Malik Xufyan WhatsApp # 0313-7355727
1 | P a g e
PPSC CHEMISTRY CLASS
Test Session
Chapter: Chemistry of Aromatic Compounds
Test No. 19
For more WhatsApp # 0313-7355727
Topics:
1. Aromaticity and Condensed Simple Aromatic Systems
2- Electrophilic Aromatic Substitution Reactions
3- Arenium ion mechanism, Orientation and Reactivity
Aromaticity and Condensed Simple Aromatic Systems
1. Which of the following is a characteristic of an aromatic compound?
(a) Cyclic
(b) Planar
(c) (4n+2) electrons
(d) All of the above
2. Which of the following compounds is not aromatic?
3. Which of the following is not a characteristic property of arenes?
(a) Delocalisation of 𝞹-electrons
(b) Resonance
(c) Greater stability

2 | P a g e
(d) Electrophilic additions
4. Which of the following statements is true for benzene?
(a) Benzene easily undergoes addition due to unsaturation
(b) 𝞹-electrons are delocalised in the benzene ring
(c) Three isomeric forms are formed on monosubstitution of benzene
(d) Two types of C-C bonds are present in benzene
5. Which of the following is incorrect for benzene?
(a) Planar C6 ring
(b) Localised 𝞹 bonding
(c) sp2
hybridised C atoms
(d) It shows reactions characteristics of C=C double bonds
6. The number of delocalised 𝞹 electrons in the benzene ring are
(a) 6
(b) 8
(c) 2
(d) 4
7. Phenanthrene is a fused polycyclic compound contains ______ benzene rings
a) 2
b) 3
c) 4
d) 5
8. Aromatic systems contain 4n+2 π-electrons where n is
a) the number of carbon atoms in the ring
b) the number of lone pairs of electrons in the molecule
c). an integer excluding zero
d) an integer.
Electrophilic Aromatic Substitution Reactions
9. Which of the following is rate determining step in electrophilic substitution reaction?
a) Generation of electrophile
b) Attack by an electrophilic reagent on benzene ring

3 | P a g e
c) Formation of product
d) All of the mentioned
10. Which of the following is the most activating in electrophilic aromatic substitution?
a) -NO2
b) -NHCOCH3
c) -CN
d) -NH2
11. Which of the following act as catalysis in the nitration of benzene?
a) Conc. HCl
b) Dil. HCl
c) Conc. H2SO4
d) Dil. H2SO4
12. Which of the following act as electrophile in halogenation?
a) Nitronium ion
b) Sulphonium ion
c) Halonium ion
d) Acylium ion
13. With respect to the electrophilic aromatic substitution of benzene which of the
following is not true?
a) A non-aromatic intermediate is formed
b) Benzene acts as an electrophile
c) A proton is lost in the final step
d) Resonance forms are important
14. Which of the following statements is incorrect: aromatic compounds...
a) Are planar
b) Have 4n π-electrons
c) Are cyclic
d) Are generally less reactive than similarly substituted alkenes
15. When considering electrophilic aromatic substitution reactions electron
withdrawing substituents (e.g. nitro) are described as
a) Ortho/para directing and activating
b) Ortho/para directing and deactivating
c) Meta directing and activating
d) Meta directing and deactivating

4 | P a g e
16. When considering electrophilic aromatic substitution reactions the halides are
described as
17. When considering electrophilic aromatic substitution reactions electron donating
subsituents (e.g. methoxy) are described as:
18. Which of the following is not associated with electrophilic aromatic substitution?
a) The formation of nitrobenzene
b) The formation of benzyne
c) The formation of bromobenzene
d) The formation of benzene sulfonic acid
Arenium ion mechanism, Orientation and Reactivity
19. What is the electrophile in the electrophilic substitution reaction of benzene using
oleum and conc. H2SO4?
a) SO3
b) NO3
c) NO2
+
d) NO+
20. What will be the attacking electrophile in this reaction?
a) Carbanion
b) Halonium

5 | P a g e
c) Radical
d) Transition state
21. Which of the following aromatic compounds undergo Friedel–Crafts alkylation with
methyl chloride and aluminium chloride?
a) Benzoic acid
b) Nitrobenzene
c) Toluene
d) Aniline
22. What will be the product in the given reaction?
a) m-chlorophenol
b) o-chlorophenol and p-chlorophenol
c) o-hydroxytoluene and p-hydroxytoluene
d) m-hydroxytoluene
23. What is the electrophile in the acylation of benzene?
a) AlCl3
b) CO+
c) Cl+
d) R-CO+
24. What will be the product in the given reaction?
a) m-chlorotoluene
b) o-chlorotoluene and p-chlorotoluene
c) 1-chloro-3-methylbenzene
d) no reaction
25. Nitration of chlorobenzene gives
a) o – chloronitrobenzene
b) p – chloronitrobenzene

6 | P a g e
c) m – chloronitrobenzene
d) A & B
26. When two or more different substituents are attached with a benzene ring the
number 1 position in the ring is given to a high priority group. Which one of the
following groups has the highest – priority?
a) -NH2
b) -CHO
c) -COOH
d) -CN
27. Which one of the following is not a meta directing group?
a) -CN
b) -OH
c) -COOH
d) -CHO
28. Which pair of groups contains both ortho & para directing groups
a) OH -RCO
b) NR3 -CN
c) OCH3 -CHO
d) N (CH3)2 -NH2
29. The reaction in which benzene reacts with alkyl halide in the presence of a lewis acid
as a catalyst to produce alkylbenzene is known as ___________
a) Nitration
b) Halogenation
c) Friedel-Crafts Acylation
d) Friedel-Crafts Alkylation
30. Which of the following is not a product of the reaction of benzene with CH3Cl and
AlCl3?
a) Toulene
b) Isopropyl benzene
c) O-xylene
d) P-xylene
31. The product of Friedel-Crafts Acylation reactions are ___________
a) Alkylbenzene
b) Alkylamine

7 | P a g e
c) Arylketone
d) Halobenzene
32. The Friedel-Crafts alkylation...
a) Works very well for primary chlorides
b) Works very well for tertiary chlorides
c) Works very well for acyl chlorides
d) Works very well without a catalyst

PPSC Chemistry Lecturer Preparation (Test # 19)- Malik Xufyan

Recommended

Recommended

More Related Content

More from Malik Xufyan

More from Malik Xufyan (20)

PPSC Chemistry Lecturer Preparation (Test # 19)- Malik Xufyan