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Aromaticity
Quiz 1
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Q.1
Aromatic compounds burn with sooty flame because
They have a relatively high percentage of hydrogen
They have a ring structure of carbon atoms
They have a relatively high percentage of carbon
They resist reaction with oxygen of air
Q.2
Select the incorrect statement.
A resonance may sometimes cause sp3 atoms to become sp2 hybridized
Delocalizing one lone pair causes aromaticity
One lone pair will be counted as two pi electrons according to Hickel's equation
Two sigma bonds make up a double bond
Q.3
The compound ?A? having formula C8H(aromatic) which gives 1 mononitro substitute and 3 nitrosubstitute compound is
m-Xylene
p-Xylene
o-Xylene
Ethyl benzene
Q.4
Pyridine is less basic than triethylamine because
Pyridine has aromatic character
Nitrogen in pyridine is sp2 hybridized
Pyridine is a cyclic system
In pyridine, lone pair of nitrogen is delocalized
Q.5
Which of the following has lowest knocking property
Olefins
Straight chain paraffins
Aromatic hydrocarbons
Branched chain paraffins
Q.6
Among the following statements on the nitration of aromatic compounds, the false one is
Nitration is an electrophilic substitution reaction
The rate of nitration of benzene is greater than that of hexadeuterobenzene
The rate of nitration of toluene is greater than that of benzene
The rate of nitration of benzene is almost the same as that of hexadeuterobenzene
Q.7
Most common reactions of benzene (aromatic hydrocarbon) and its derivatives are
Electrophilic addition reactions
Electrophilic substitution reactions
Nucleophilic addition reactions
Nucleophilic substitution reactions
Q.8
Coaltar is main source of
Aromatic compounds
Aliphatic compounds
Cycloalkanes
Heterocyclic compounds
Q.9
A detergent is a
Cleansing agent
Drug
Catalyst
Soap
Q.10
Freon used as refrigerant is chemically
Chlorinated hydrocarbon
Fluoridated hydrocarbon
Chlorofluoro hydrocarbon
Fluorinated aromatic compound
Q.11
Which one is the simplest aromatic hydrocarbon?
Aspirin
Benzene
Chloride
Picric acid
Q.12
Wax used for making candle is chemically a mixture of
Aliphatic hydrocarbons
Aromatic hydrocarbons
Cyclic hydrocarbons
Aliphatic and aromatic hydrocarbons
Q.13
Which of the following is an incorrect description of benzene?
The molecule is planar.
The molecule is aromatic.
The molecule is a 6-membered ring which contains alternating single and double carbon-carbon bonds.
The CCC bond angles are all equal to 120°.
Q.14
Which of the following statements is true for benzene?
Two types of C-C bonds are present in benzene
Benzene easily undergoes addition due to unsaturation
𝞹-electrons are delocalised in the benzene ring
Three isomeric forms are formed on monosubstitution of benzene
Q.15
Which of the following is not a characteristic property of arenes?
Resonance
Greater stability
Electroscopic additions
Delocalisation of 𝞹-electrons
Q.16
Stability sequence: primary carbocation > secondary carbocation > tertiary carbocation. Is this sequence correct?
Yes
No
Q.17
Select the correct statement regarding the aromatic nitrogen molecule
It is sp hybridized
It is not hybridized
It is sp2 hybridized
It is sp3 hybridized
Q.18
Which of the following is a characteristic of an aromatic compound?
Planar
Cyclic
(4n+2)𝞹 electrons
All of the above
Q.19
Aromatic rings do not have resonance structures
False
True
Q.20
Which of the following is the reactive species in the nitration of benzene?
NO2–
NO2+
NO3
HNO3
0 h : 0 m : 1 s
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