Alkenes Quiz
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5 questions, one answer each
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1. What is the molecular formula of propene?
- A. C₃H₈
- B. C₃H₄
- C. C₃H₆
- D. C₃H₇
2. What is observed when ethene is shaken with bromine water?
- A. The orange-brown colour disappears
- B. The mixture stays orange-brown
- C. The mixture turns blue
- D. A white solid forms
3. Which equation shows the addition of hydrogen to ethene?
- A. C₂H₄ + H₂ → C₂H₂
- B. C₂H₆ + H₂ → C₂H₄
- C. C₂H₄ + 2H₂ → C₂H₈
- D. C₂H₄ + H₂ → C₂H₆
4. Which statement about an addition reaction is correct?
- A. Two products are always formed
- B. Only one product is formed
- C. The double bond becomes a triple bond
- D. The alkene becomes more unsaturated
5. A hydrocarbon has the formula C₅H₁₀. Which test result and conclusion are correct?
- A. It stays orange-brown with bromine water, so it is an alkene
- B. It decolourises bromine water, so it is an alkane
- C. It decolourises bromine water, so it is an alkene
- D. It cannot be tested with bromine water