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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section

Unsaturated hydrocarbons

19 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Easy

  1. Question 1

    1 mark · Easy

    State the molecular formula of a branched isomer of butene.

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  2. Question 2

    3 marks · Easy

    (a)

    Name the alkene with three carbon atoms.

    [1 mark]
    (b)

    Draw the displayed formula of this alkene.

    [1 mark]
    (c)

    Write the molecular formula of this alkene.

    [1 mark]
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  3. Question 3

    2 marks · Easy

    An alkene contains 5 carbon atoms per molecule. Calculate the number of hydrogen atoms in a molecule of this alkene.

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  4. Question 4

    2 marks · Easy

    Explain why butene (C4H8) can exist as several different structural isomers.

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  5. Question 5

    3 marks · Easy

    Some alkenes and their number of hydrogen atoms
    NameNumber of carbon atomsNumber of hydrogen atoms
    Ethene24
    Propene36
    Butene48
    (a)

    State the general formula for alkenes.

    [1 mark]
    (b)

    Complete the table for pentene.

    [1 mark]
    (c)

    Explain the pattern in the number of hydrogen atoms as the number of carbon atoms increases in alkenes.

    [1 mark]
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  6. Question 6

    1 mark · Easy

    State what feature of alkenes makes them unsaturated hydrocarbons.

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  7. Question 7

    3 marks · Easy

    (a)

    Draw the displayed formula of a straight-chain isomer of butene where the double bond is between the second and third carbon atoms.

    [2 marks]
    (b)

    Name this isomer.

    [1 mark]
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  8. Question 8

    2 marks · Easy

    Calculate the molecular formula of the alkene with 6 carbon atoms.

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