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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Alkenes

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Alkenes

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Paper 3Theory (Core)4 marks

Understanding the properties of hydrocarbons is essential in organic chemistry.

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Hydrocarbon Properties

Consider the following hydrocarbons: 1. Butane (C4H10) 2. Butene (C4H8) 3. Cyclobutane (C4H8) 4. Ethylene (C2H4)

  1. a

    Discuss The differences in reactivity of the hydrocarbons listed above with bromine water.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 3 structured question: Alkenes

Paper 3Theory (Core)3 marks

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Bromine Water Test

When bromine water is added to a sample of hydrocarbon, the following observations are made: 1. The solution remains brown. 2. The solution turns colourless.

  1. a

    Analyse Explain the observations made when bromine water is added to saturated and unsaturated hydrocarbons.

    Aim for approximately 3 distinct marking points.

    [3]