Quiz  /  Benzene Class 11 MCQ Questions With Answers

  • 1. 
    Which of the following is FALSE about the property of benzene molecule?

  • A. It is a planar molecule.
  • B. It is stabilised by delocalisation of ℼ electrons.
  • C. Each carbon atom undergoes sp hybridisation.
  • D. Its typical reaction is electrophilic substitution.

  • 2. 
    Alcohol can be produced by the following methods except

  • fermentation of glucose
  • catalytic addition of steam to ethene
  • cracking of long chain hydrocarbon

  • 3. 
    What is the molecular formula of Benzene?

  • C6H12
  • C6H6
  • C6H10
  • C8H8

  • 4. 
    Aromatic compounds usually undergo which type of reaction?

  • Electrophilic substitution reaction
  • Electrophilic addition reaction
  • Nucleophilic substitution reaction
  • Nucleophilic addition reaction

  • 5. 
    The species that attacks the benzene molecule in the nitration of benzene using a mixture of concentrated sulphuric acid and concentrated nitric acid is

  • A. ⋅NO2
  • B. NO2+
  • C. HNO3
  • D. NO3 -

  • 6. 
    What is the C-C bond length in Benzene?

  • 0.137 nm
  • 0.138 nm
  • 0.139 nm
  • 0.140 nm

  • 7. 
    What is the C-C Bond angle in benzene?

  • 1200
  • 1200 & 109.50
  • 109.50
  • 104.50 & 1200

  • 8. 
    How many delocalised electrons (pi electrons) are there for each benzene molecule?

  • 2
  • 3
  • 6
  • 12

  • 9. 
    Benzene is ......

  • trigonal planar
  • boat shaped
  • planar
  • chair shaped

  • 10. 
    Which of the following reagent does not react with benzene?

  • A. Concentrated H2SO4
  • B. HNO3/ H2SO4
  • C. Iodoehane in the presence of iron
  • D. Sodium hydroxide solution

  • 11. 
    Nitronium ion, NO2+, attacks the electrons of the aromatic ring of benzene. Name the type of reaction involved.

  • A. Free radical substitution
  • B. Electrophilic aromatic substitution
  • C. Nucleophilic aromatic substitution
  • D. Electrophilic aromatic addition

  • 12. 
    Which of the reagents below does NOT react with methylbenzene?

  • A. Bromine gas/iron catalyst
  • B. Aqueous bromine in catalyst
  • C. Acidified potassium manganite (VII)
  • D. Dilute sulphuric acid

  • 13. 
    Which of the following is FALSE about ethene and benzene?

  • A. Both are planar molecules
  • B. Both are non-polar molecules
  • C. Both exhibit sp2 hybridisation
  • D. Both have the same C:H ratio

  • 14. 
    Which two of these statements about the delocalised model of benzene are true?

  • Each carbon has three sigma bonds with two other carbon atoms and one hydrogen atom, using three bonding electrons
  • Benzene is a regular hexagon of carbon bonds with the same length with bonds to hydrogen at the corners
  • The delocalised electrons form a ring of electron density in the plane of the benzene ring
  • Both A & B

  • 15. 
    What organic product is formed when benzene reacts with nitric acid in the presence of concentrated sulfuric acid?

  • a
  • b
  • c
  • d

  • 16. 
    Nitrobenzene can be prepared by reacting benzene with a mixture of concentrated sulphuric acid and concentrated nitric acid.Which of the following statement best describes the role of concentrated sulphuric acid

  • A. To get rid of water molecules
  • B. To form an unstable complex with benzene
  • C. To protonate nitric acid
  • D. To act as solvent

  • 17. 
    Which of the statement is TRUE about electrophilic aromatic substitution?

  • A. Substitution of hydrogen atom in methane by chlorine atom
  • B. Substitution of hydrogen atom in benzene by NO2+
  • C. Substitution of chlorine atom in ethanoyl chloride by CH3O-
  • D. Substitution of -OH in ethanol by CI-

  • 18. 
    What is the organic product of the following reaction?

  • A
  • B
  • C
  • D

  • 19. 
    The only compound that will yield benzoic acid when reacted with acidified potassium dichromate (VI) solution is

  • A. CH2=CH2
  • B. C6H5C(CH3)3
  • C. C6H5CH(CH2CH3)2
  • D. Cyclohexane

  • 20. 
    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

  • 21. 
    What is the other name of aromatic hydrocarbons?

  • Alkenes
  • Alkynes
  • Arenes
  • Alkanes

  • 22. 
    Which of the following will produce chlorobenzene when chlorine was passed through it?

  • A. Iodobenzene at 20⁰C
  • B. Bromobenzene in the presence of iron
  • C. Benzene in the presence of iron
  • D. Benzene in the presence of light

  • 23. 
    Which of the following transformations could be feasibly carried out in a single step using the Friedel–Crafts alkylation?

  • A
  • B
  • C
  • D
Report Question
warning
access_time
  Time