Radical substitution of alkanes

Radical substitution of alkanes Quiz

Spec 6B · Edexcel A-Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. Which species is a radical?

    • A. Cl•
    • B. Cl⁻
    • C. HCl
    • D. Cl₂

  2. 2. What is the name of the step Cl• + Cl• → Cl₂?

    • A. Initiation
    • B. Propagation
    • C. Termination
    • D. Substitution

  3. 3. Which is a propagation step in the reaction of ethane with chlorine?

    • A. Cl₂ → 2Cl•
    • B. C₂H₅• + Cl• → C₂H₅Cl
    • C. C₂H₆ + Cl• → C₂H₅• + HCl
    • D. 2C₂H₅• → C₄H₁₀

  4. 4. Why is radical substitution unsuitable for making pure chloromethane?

    • A. The reaction needs a catalyst
    • B. Chlorine radicals are unreactive
    • C. Methane does not contain hydrogen
    • D. Further substitution gives dichloromethane and other products

  5. 5. A small amount of butane is found when ethane reacts with chlorine in ultraviolet light. How did it form?

    • A. Initiation by homolytic fission of ethane
    • B. Termination: two ethyl radicals combined
    • C. Propagation: ethyl radical reacting with chlorine
    • D. Heterolytic fission of the C–Cl bond

Quiz