Alkenes

Alkenes Quiz

Spec 4.23–28 · Edexcel IGCSE Chemistry: Quiz

Studying this course? Keep your progress in one place.

Pick an answer for each. Quizzes never use energy.

5 questions, one answer each

Each answer is checked as you go, with why.

See all 5 questions

  1. 1. What functional group is characteristic of alkenes?

    • A. -OH
    • B. -COOH
    • C.
      C=C<
    • D. -COO-

  2. 2. What is the general formula for alkenes?

    • A. CnH2n+2
    • B. CnH2n
    • C. CnH2n-2
    • D. CnHn

  3. 3. What type of reaction occurs when bromine reacts with an alkene?

    • A. Substitution
    • B. Addition
    • C. Combustion
    • D. Neutralisation

  4. 4. A student shakes an unknown colourless liquid hydrocarbon with bromine water and the orange colour disappears. What does this show?

    • A. The hydrocarbon is saturated
    • B. The hydrocarbon is an alkene (unsaturated)
    • C. The hydrocarbon is water-soluble
    • D. The hydrocarbon is a carboxylic acid

  5. 5. Propene (C3H6) reacts completely with bromine. Which product forms, and why does the bromine water lose its colour?

    • A. 1,2-dibromopropane forms, as bromine is used up adding across the double bond
    • B. Propane forms, as bromine substitutes a hydrogen
    • C. Carbon dioxide and water form from combustion
    • D. No product forms; the colour change is physical only

Quiz