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