Structure and bonding of benzene Quiz
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5 questions, one answer each
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1. What is the length of each carbon–carbon bond in benzene?
- A. 0.134 nm
- B. 0.154 nm
- C. 0.140 nm, between a single and a double bond
- D. Three of 0.154 nm and three of 0.134 nm
2. Benzene has an enthalpy change of hydrogenation of −208 kJ mol⁻¹. The Kekulé structure predicts −360 kJ mol⁻¹. What does this show?
- A. Benzene is 152 kJ mol⁻¹ more stable than the Kekulé structure
- B. Benzene is 152 kJ mol⁻¹ less stable than the Kekulé structure
- C. Benzene has three C=C double bonds
- D. Benzene has no π electrons
3. What forms the delocalised π system in benzene?
- A. Overlap of s orbitals
- B. End-on overlap of sp³ orbitals
- C. Overlap of hydrogen orbitals
- D. Sideways overlap of p orbitals above and below the ring
4. Why does benzene resist bromination compared with an alkene?
- A. It has no π electrons
- B. Its π electron density is delocalised, so lower at any one position
- C. It has a higher boiling temperature
- D. It has stronger C–H bonds
5. What is the C–C–C bond angle in benzene?
- A. 109.5°
- B. 180°
- C. 90°
- D. 120°