Electrophilic substitution of benzene Quiz
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5 questions, one answer each
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1. Which species is removed from the intermediate in the final step of electrophilic substitution?
- A. A hydride ion, H⁻
- B. A proton, H⁺
- C. The electrophile
- D. A hydroxide ion
2. What is the role of AlCl₃ in the reaction of benzene with CH₃COCl?
- A. It acts as a nucleophile
- B. It oxidises benzene
- C. It accepts a lone pair from Cl to generate CH₃CO⁺ and is regenerated
- D. It dehydrates the acyl chloride
3. Why is the nitration of benzene carried out at about 50 °C and not much higher?
- A. The nitrating mixture boils at 60 °C
- B. The catalyst is destroyed above 50 °C
- C. Benzene would be oxidised to carbon dioxide
- D. Further substitution would give dinitrobenzene
4. Which observation is made when benzene is shaken with bromine water?
- A. The bromine water is decolourised at once
- B. A white precipitate forms
- C. No reaction occurs
- D. The mixture turns green
5. Why does phenol react with bromine water more easily than benzene?
- A. Phenol has a lone pair on oxygen delocalised into the ring, increasing its electron density
- B. Phenol contains more carbon atoms
- C. Phenol is more soluble and so is a stronger acid than benzene
- D. Phenol contains a C=C bond that undergoes addition