Chapter # 9 Aromatic Hydrocarbons MCQs
1.
The molecular formula of
toluene is_______
a)
C7H7 b) C7H8
c)
C8H8 d) C8H7
2.
In benzene sulphonic acid,
the sulphonic group is attached with
benzene ring
through_____
a)
Hydrogen b) Oxygen
c)
Sulpher d)
–OH
3.
Phenanthrene ________
benzene rings
a)
Two b)
Three
c)
Four d)
Five
4.
Aniline is a derivative of
benzene which contains______
a) Hydroxyl group b) Amino group
c)
Amido group d) Imido group
5.
How many π electrons are
there in benzene?
a) 3 b) 4
c) 6 d) 8
6.
The molecular formula of
biphenyl methane is____________
a)
C12H10 b) C12H12
c)
C13H10 d) C13H12
7.
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 highest
priority?
a)
–NH2 b)
–CHO
c)
–COOH d)
–CN
8.
When benzene is substituted
by halogens only, which one of the
following halogens is given the number
one position in the ring while
writing the name of compound?
a)
Bromine b)
Chlorine
c)
Flourine d) Iodine
9.
Which one of the following
is not a meta directing group?
a)
–CN b)
–OH
c)
–COOH d)
–CHO
10.
Which pair of groups
contains both ortho & para
directors?
a.
–OH, –RCO
b.
–NR3, –CN
c.
–OCH3, –CHO
d.
–N (CH3)2,
–NH2
11.
Michael Faraday discovered
benzene in the gas which was produced by
destructive distillation of vegetable
oil done in_________
a.
The presence of Oxygen
b.
The presence of Hydrogen
c.
The absence of Oxygen
d.
The presence of excessive
Oxygen
12.
How many moles of H2
are added up when benzene is heated with
hydrogen in the presence of platinum?
a)
Two b)
Three
c)
Four d)
Six
13.
In benzene the C-C bond
length is larger than the C-H bond
length by a numerical value
of____________
a)
0.307Ao b)
0.307 nm
c)
0.337Ao d)
0.307 nm
14.
The heat of hydrogenation
of cyclohexene is
_____________
a.
-219.5 KJ/ mole
b.
219.5 calories/ mole
c.
-119 KJ/ mole
d.
-119 Cal/ mole
15.
The resonance energy of
benzene is______
a.
150.5 KJ/ mole
b.
250.5 KJ/ mole
c.
150.5 KJ/ mole
d.
250.5 KJ/ mole
16.
The resonance between
different structures is represented
by______
a.
b.
c.
d. ~
17.
What catalyst is employed
when benzene is prepared from acetylene
at 70˚C?
a.
Zn amalgam
b.
AlCl3
c.
Organo-nickel
d.
Rancy Rickel
18.
Mixture of catalysts Cr2O3
+ Al2O3 + SiO2 at 500˚C are used when benzene is prepared
from____________
a.
Cycloalkene
b.
n-hexane
c.
Benzene sulphonic acid
d.
Sodium benzoate
19.
Which one of the following
methods will not give benzene?
a.
Heating so. Salt of Benzoic
acid with soda lime
b.
Distillation phenol with Zn
dust
c.
Chlorobenzene with NaOH at
360
˚C
& 300atm.
d.
Hydrolysis of benzene
sulphonic acid with super heated steam.
20.
What is the ratio of conc.
HNO3 & conc. H2SO4
when nitration of benzene is done at
50˚C?
a)
1:1 b)
2:1
c)
1:2 d)
2:3
21.
In Friedel Craft
Alkylation, AlCl3 is used to
generate___________
a.
Strong nucleophile
b.
Weak nucleophile
c.
Strong electrophite
d.
Weak electrophite
22.
Acylation of benzene is the
introduction of ___________on benzene.
O
||
a.
R ─ C ─
O ─
O
||
b.
Cl ─
C ─
O
||
c.
R ─ C ─
O
||
d.
H ─
C ─
23.
Acetophenone is a
______________
a)
Quinone b)
Ketone
c)
Aldehyde d) Other
24.
Reacting bromine with
benzene in the presence of sunlight will
result in__________
a.
The rupturing of Benzene mg
b.
Substitution reaction
c.
Addition reaction
d.
No-reaction
25.
Benzene does not undergo
___________
a.
Substitution reaction
b.
Addition reaction
c.
Polymerization reactions
d.
Oxidation reactions
26.
During sulphonation of
benzene, H2SO4
generates____________ electrophile
a)
HSO4- b)
SO2
c)
NO2- d) NO2+
27.
Nitronium ion
is_____________
a)
NO3 b)
NO
c)
NO2- d) NO2+
28.
Which compound will readily
undergo sulphonation?
a)
Benzene b)
Nitro benzene
c)
Golvene d)
Chlorobenzene
29.
Benzene is heated in air
with V2O5 at 450˚C it
undergo ___________
a.
Substitution reaction
b.
Addition reaction
c.
Elimination reaction
d.
Oxidation reaction
30.
Which one of the following
statement is not correct about benzene?
a.
On hydrogenation, 208 KJ/
mole is liberated
b.
C-H bond length in benzene
is 1.09Ao
c.
Molecular mass of benzene
is 78.108
d.
Resonance energy of benzene
is 150.5 K Cal / mole
31.
The preparation of benzene
from acethylene can also be said as
________
a)
Oxidation b) Polymerization
c)
Dehydration d) Condensation
32.
What is required other then
anhydrous AlCl3, when toluene
is prepared from Friedel craft reaction?
a)
C6H6 b)
C6H6 + CH3Cl
c)
C6H5C2H5 d)
C6H5 ─ CH2─
33.
Replacement of hydrogen of
benzene by alkyl
group in pressure of alkyl
halide & ferric
chloride is known as____________
a.
Dow’s process
b.
Friedel & Craft
acylation
c.
Friedel & Craft
alkylation
d.
Clemenson reaction
34.
Which of the following
radical is called benzyl radical?
a)
C6H5─ b)
C6H5─CH=CH2
c)
C6H5─CH─ d)
C6H5─CH2─
35.
Which compound form benzoic
acid on oxidation with strong oxidizing
agent?
a)
Toluene b)
Ethyle benzene
c) n-propyl bezene d) all
36.
Toluene can be converted to
benzoic acid in presence of _________
a.
Dil NaO4
b.
Mixture of HNO3
& H2SO4
c.
Zn dust
d.
Acidified KMnO4
37.
Which one of the following
is benzal chloride?
a.
C6H5
CH2Cl
b.
C6H5
CHCl2
c.
C6H5─CH
= CHCl
d.
None of the above
38.
What is the molecular
formula of Benzenetriozonide?
a)
C6H6O9 b) C6H5O8
c)
C6H5O9 d) C6H6O6
39.
The hydrolysis of
Benzenetriozonide will yield three moles
of ________
a)
Glyoxine b) Benzaldehyde
c)
Glycol d)
Glyoxal
40.
Which of the following will
undergo nitration more easily and readily?
a) C6H6 b)
C6H5CHCl2
c) C6H5CCl3
d)
C6H5CH3
41.
The reaction of toluene
with chlorine in the presence of FeCl3 gives
a) Benzyl chloride
b) Benzal chloride
c) m – Chloro Toluene
d) O/P Chloro Toluene
42.
Benzene is made of
a) 6 Pi and 6 sigma bonds
b) 3 Pi and 3 sigma bonds
c) 3 Pi and 12 sigma bonds
d) 6 Pi and 3 sigma bonds
43.
Common reaction of Benzene
and its derivatives are
a) Electrophilic addition
b) Electrophilic substitution
c) Nucleophilic addition
d) Nucleophilic substitution
44.
Benzene when treated with
acetyl chloride in the presence of AlCl3 yields
a)
Acetyl Benzene b) Benzyl Chloride
c)
Benzophenone d) Acetophenone
45.
Passing vapors of Phenol
over heated Zinc gives
a)
Benzene b)
Acetic Acid
c)
Benzoic Acid d) Benzaldehyde
46.
Which of the following is
not an explosive?
a)
Picric Acid b)
Trinitrobenzene
c)
Trinitro Toluene d) Nitro benzene
47.
Toluene on reaction with
acidic KMnO4 produces
a)
Phenol b)
Benzoic acid
c)
Benzyl alcohol d) Benzophenone
48.
The b.p of P – nitro phenol
is higher than that of O – nitro phenol because
a) Nitro group is O/P group
b) Nitro group is electron donating group
c) Bonding occurs in P – nitro phenol
d) None of these
49.
Which of the following can
be easily nitrated?
a)
Phenol b)
Benzoic acid
c)
Nitro benzene d) All of these
50.
Aspirin is obtained by
reaction of sulphuric acid and
a)
Phenol b)
Benzene
c)
Acetyl chloride d) None of these
51.
Sulphonation of benzoic
acid gives
a) O – benzene sulphonic acid
b) P – benzene sulphonic acid
c) m – benzene sulphonic acid
d) O/P benzene sulphonic acid
52.
Benzene can be obtained
by
a) Reaction of zinc and phenol
b) Hydrolysis of benzene sulphonic acid
c) Reduction of benzene chloride
d) All of these
53.
o – xylene on oxidation
yields
a)
Oxalic acid b)
o – Phthalic acid
c)
Toluene d)
m – Phthalic acid
54.
The resonance energy of
benzene is
a) 36
j/mol b)
36 cal/mol
c) 36
Kcal/mol d) none of these
55.
The catalyst used for
halogenation of benzene is
a)
Cu b)
Ni
c)
FeCl3 d)
Zn
56.
Which one is nitronium ion?
a)
NO31
b)
NO21
c)
NH41
d)
None of these
57.
Which substituent group
decrease the reactivity of benzene, because they
a) Increase the electronic density of benzene ring
b) Decrease the electronic density of benzene ring
c) Decrease the stability of phenonium ion
d) Both b & c
58.
Benzene on ozonolysis
produces
a)
Benzoic acid b) Cyclohexane
c)
Glyoxal (CHO2)2 d)
None of these
59.
Meta orienting groups
decrease the reactivity of benzene because they
a) Increase the electronic density of benzene
b) Decrease the electronic density of benzene
c) Decrease the stability of phenonium ion
d) Both b & c
60.
Benzene was found by
_______ in 1825 in the gas produced by the destructive
distillation of vegetable oils.
a)
Hofmann b)
Michael Faraday
c)
Solvay d)
None of these
61.
Replacement of hydrogen
atom by – SO2OH is
called
_______
a)
Nitration b) Sulphonation
c)
Alkylation d) Hydrogenation
62.
The Kekule structures of
benzene are related in which of the following way?
a) They are eac equally correct as structure for benzene.
b) Benzene is sometimes one structures and sometime the other.
c) The two structures are in a state of rapid equilibrium.
d) Neither of the two structures describes
benzene adequately
63.
The conversion of toluene
into benzoic acid
can
be achieved by
a) Br2, heat and light
b) Cl2, FeCl3
c) KMnO4, OH-, heat (then H3O+)
d) None of the above
64.
The conversion of ethyl
benzene into 1 – chloro – 1 – phenyl ethane can be achieved
by
a)
Cl2, light b)
Cl2, FeCl3
c)
SOCl2 d)
None
65.
Benzene reacts with
chlorine to give a substance with formula C6H6Cl6.
This reaction
is
brought about by
a)
An acid catalyst b) Ultraviolet
radiation
c)
Aluminum oxide d) Iron fillings
66.
Which of the following will
be least reactive to ring bromination using bromine water?
a)
Toluene b)
Nitrobenzene
c)
Chlorobenzene d) Aniline
67.
Benzene and cyclohexene can
be distinguished
by which of the following test?
a)
AgNo3 │C2H5OH b)
Ag(NH3)2OH
c)
Br2 │CCl4 d)
None
68.
Which of the following test
can be used to distinguish C6H5CH2Br and C6H5CH3?
a)
Ag(NH3)2OH b) Br2 │CCl4
c)
AgNO3 │C2H5OH d)
Hot KMnO4
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