Structure and stability of benzene Quiz
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5 questions, one answer each
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1. What is the length of the carbon–carbon bonds in benzene?
- A. 0.154 nm
- B. 0.134 nm
- C. 0.140 nm
- D. 0.120 nm
2. Which statement about the delocalisation energy of benzene is correct?
- A. It is 152 kJ mol⁻¹ and benzene is more stable than the Kekulé structure
- B. It is 152 kJ mol⁻¹ and benzene is less stable than the Kekulé structure
- C. It is 208 kJ mol⁻¹ and benzene is more stable
- D. It is 360 kJ mol⁻¹ and benzene is less stable
3. An infrared spectrum of benzene shows no absorption at 1620–1680 cm⁻¹. What does this indicate?
- A. Benzene contains no carbon atoms
- B. Benzene has no hydrogen atoms
- C. Benzene is a saturated alkane
- D. Benzene has no localised C=C bonds
4. How are the p orbitals in benzene arranged?
- A. Overlapping end-on along the C–C axis
- B. Overlapping sideways above and below the plane of the ring
- C. Lying in the plane of the ring
- D. Each held by a single carbon atom only
5. Why does benzene resist reacting with bromine water compared with cyclohexene?
- A. Its delocalised electron density is lower, so it cannot polarise Br₂ enough
- B. It has a localised π bond
- C. It has more electrons than cyclohexene
- D. It contains no carbon atoms