IGCSE Chemistry 0620/21/O/N/21 Q33

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33 An alkane molecule of molecular formula C8H18 undergoes cracking. The equation for the reaction is shown.

C8H18 → Q + 2R

Substance R has two carbon atoms per molecule and decolourises aqueous bromine.
What is substance Q?

A butane
B butene
C ethane
D ethene

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Answer ( 1 )

    0
    2022-05-12T16:58:59+08:00

    Because substance R has two carbon atoms per molecule and decolourises aqueous bromine, substance R is ethene, C2H4

    The equation shows a product involving 2 moles of ethene, this leaves us with 4 carbon atoms and 10 hydrogen atoms.

    Hence, we can conclude that Q is C4H10, butane.

    Ans: A

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