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BENZENE MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. Which two of these statements about the delocalised model of benzene are true?
  1.    Each carbon has three sigma bonds with two other carbon atoms and one hydrogen atom, using three bonding electrons
  2.    Benzene is a regular hexagon of carbon bonds with the same length with bonds to hydrogen at the corners
  3.    The delocalised electrons form a ring of electron density in the plane of the benzene ring
  4.    Both A & B
 Discuss Question
Answer: Option D. -> Both A & B
Question 12. What is the C-C Bond angle in benzene?
  1.    1200
  2.    1200 & 109.50
  3.    109.50
  4.    104.50 & 1200
 Discuss Question
Answer: Option A. -> 1200
Question 13. What is true about C-C bond lengths in benzene?
  1.    alternative longer and shorter length
  2.    All the same length 
  3.    All different length
  4.    two are the same length and the third one is different
 Discuss Question
Answer: Option B. -> All the same length 
Question 14. What is the C-C bond length in Benzene?
  1.    0.137 nm
  2.    0.138 nm
  3.    0.139 nm
  4.    0.140 nm
 Discuss Question
Answer: Option C. -> 0.139 nm
Question 15. How did Kakule try to account for the initial problems with his original benzene structure?
  1.    Told his critics to deal with it
  2.    Crouched in a corner and cry
  3.    Proposed an equilibrium model
  4.    Made a new model with international bond length
 Discuss Question
Answer: Option C. -> Proposed an equilibrium model
Question 16. Which of these are not evidence for the delocalised model?
  1.    X-ray crystallography shows all bonds are same length
  2.    Benzene is resistant to bromination
  3.    Enthalpy of hydrogenation shows it is less than expected
  4.    Enthalpy of hydrogenation shows it is  more than expected
 Discuss Question
Answer: Option D. -> Enthalpy of hydrogenation shows it is  more than expected
Question 17. How was the current accepted structure of benzene discovered?
  1.    NMR
  2.    Staring at it intently under an electron microscope
  3.    X-ray diffraction
  4.    Edexcel discovered it
 Discuss Question
Answer: Option C. -> X-ray diffraction
Question 18. What is the resonance energy of Benzene?
  1.    151 KJ mol-1
  2.    152 KJ mol-1
  3.    153 KJ mol-1
  4.    154 KJ mol-1
 Discuss Question
Answer: Option B. -> 152 KJ mol-1
Question 19. The bond length of c-c bond in benzene is
  1.    1.45 A
  2.    1.38A
  3.    1.33A
  4.    1.23A
 Discuss Question
Answer: Option B. -> 1.38A
Question 20. What is the accepted current view of the model for bonding in benzene?
  1.    Delocalised model
  2.    Kekule structure
  3.    Resonance structure
  4.    Arrhenius structure
 Discuss Question
Answer: Option A. -> Delocalised model

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