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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Alkenes

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Alkenes

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Paper 4Theory (Extended)1 marks

Addition reactions of alkenes

Description

Reactions of Alkenes

Alkenes can undergo various addition reactions. For example, when ethene reacts with bromine, it forms dibromoethane. When ethene is hydrogenated in the presence of a nickel catalyst, it forms ethane. Additionally, when ethene reacts with steam and an acid catalyst, it produces ethanol.

  1. a

    State the product formed when ethene reacts with bromine.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Alkenes

Paper 4Theory (Extended)3 marks

Description

Hydrogenation Process

When alkenes are treated with hydrogen gas in the presence of a nickel catalyst, they are converted into alkanes. For example, ethene can be converted to ethane through this process.

  1. a

    Describe the process of hydrogenation of alkenes and the product formed.

    Aim for approximately 3 distinct marking points.

    [3]