Bonding and stability of benzene Quiz
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5 questions, one answer each
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1. What is the C–C bond length in benzene?
- A. 0.154 nm
- B. 0.134 nm
- C. 0.140 nm
- D. 0.120 nm
2. The enthalpy change of hydrogenation of cyclohexene is −120 kJ mol⁻¹. What is the predicted value for cyclohexa-1,3,5-triene?
- A. −120 kJ mol⁻¹
- B. −240 kJ mol⁻¹
- C. −360 kJ mol⁻¹
- D. −480 kJ mol⁻¹
3. Benzene's measured enthalpy change of hydrogenation is −208 kJ mol⁻¹. What does this show?
- A. Benzene is 152 kJ mol⁻¹ less stable than the triene
- B. Benzene is 152 kJ mol⁻¹ more stable than the triene
- C. Benzene has three C=C bonds
- D. Benzene reacts with four moles of hydrogen
4. Which type of orbital overlap forms the delocalised system in benzene?
- A. Head-on overlap of s orbitals
- B. Head-on overlap of sp³ orbitals
- C. Sideways overlap of p orbitals
- D. Overlap of d orbitals
5. A student says benzene undergoes addition reactions as readily as cyclohexene. Which statement best shows why this is wrong?
- A. Benzene has more hydrogen atoms
- B. Addition would destroy the delocalised system and lose its extra stability
- C. Benzene has a larger Mr
- D. Benzene has no electrons in p orbitals