Q.1
How many sigma bonds are there in benzene
  • 4
  • 6
  • 8
  • 12
Q.2
What is true about C-C bond lengths in benzene?
  • alternative longer and shorter length
  • All the same length
  • All different length
  • two are the same length and the third one is different
Q.3
Which of these are not evidence for the delocalised model?
  • X-ray crystallography shows all bonds are same length
  • Benzene is resistant to bromination
  • Enthalpy of hydrogenation shows it is less than expected
  • Enthalpy of hydrogenation shows it is  more than expected
Q.4
The bond length of c-c bond in benzene is
  • 1.45 A
  • 1.38A
  • 1.33A
  • 1.23A
Q.5
The color of Kmno4 changes in test for unsaturation reaction is due to
  • oxidation
  • reduction
  • hydrogenation
  • all
Q.6
Which of them is Hetero cyclic aromatic compound
  • benzene
  • Toluene
  • Pyridine
  • Xylene
Q.7
What is 'n' in Huckel rule
  • number of ring
  • number of catom
  • any integer
  • none
Q.8
What happens when benzene reacts with bromine in ferric bromide?
  • it forms dibromo benzene
  • forms mono bromo benzene
  • both
  • none
Q.9
How many electrons are there in the delocalised pi electron system in benzene?
  • 3
  • 6
  • 9
  • 12
Q.10
A reagent that could be used to distinguish between benzene and cyclohexene is ...
  • Acidified K2Cr2O7
  • Tollens reagent
  • Bromine water
  • Sodium carbonate
Q.11
The formula for the nitronium ion is
  • NO2+
  • NO2
  • NO2+
  • NO22+
Q.12
What form of reaction mechanism is benzene normally involved in?
  • Electrophillic substitution
  • Electrophillic addition
  • Electophillic addition elimination
  • Nucleophilic substitution
Q.13
The nitration of benzene uses a nitrating mixture of concentrated nitric acid and concentrated sulfuric acid. HNO3 + 2H2SO4 → NO+ H3O+ + 2HSO4–Which statement is correct?
  • HNO3 acts as a base.
  • HNO3 acts as a catalyst.
  • HNO3 acts as an electrophile.
  • HNO3 acts as a reducing agent.
Q.14
An electrophile is ...
  • an electron pair donor
  • an electron pair acceptor
  • a negatively charged ion
  • a proton donor
Q.15
C-C bonds formed in benzene by
  • Sp-S overlapping
  • Sp2- sp Overlapping
  • Sp2-Sp2 overlapping
  • S-sp2 overlapping
Q.16
Write the name of scientist who gave the structure of benzene first.
  • Kekule
  • August Kekulé
  • None of these
Q.17
Resonance stabilized is due to
  • strong covalent bond
  • strong pi bond
  • delocaloisation of pi electrons
  • delocalisation of sigma electrons
Q.18
What is produced when benzene reacts with chlorine in the presence of an iron catalyst?
  • only chlorobenzene
  • chlorobenzene and chlorine atoms
  • chlorobenzene and hydrogen chloride
  • chlorobenzene and water
Q.19
Alcohol can be produced by the following methods except
  • fermentation of glucose
  • catalytic addition of steam to ethene
  • cracking of long chain hydrocarbon
Q.20
Which of the following is considered a disubstituted benzene?
  • Phthalic acid
  • Benzoic acid
  • Acetophenone
  • Benzophenone
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