Which of the following substances would decolourise bromine? .

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When considering which substances can decolourise bromine water, we need to recall that bromine is decolorised by substances that can react with or add across the bromine's double bond.
Option a: methane. Methane is an alkane with only single bonds and is relatively inert under mild conditions; it does not readily undergo reactions that would remove bromine's color, so this choice is not correct.
Option b: ethane. Like methane, ethane is an alkane with single bonds and lacks the unsaturation required to add across a double bond; bromine water would not be decolourised by ethane, so this is incorrect.
Option c: 1,2-dibromoethane. This compound already contains bromine atoms bonded to the carbons of an alkane-like framework and has no available C=C bond to react with additional bromine; thus it would not decolourise bromine water, making this option incorrect.
Option d: ethene. Ethene is an unsaturated alkene with a carbon–carbon double bond, which can undergo electrophilic addition with bromine (Br2). This reaction breaks the Br–Br bond and forms a vicinal dibromide, causing the bromine solution to lose its color; this makes ethene the correct choice.
In summary, only alkenes like ethene readily decolourise bromine water due to their C=C double bonds enabling addition reactions, while alkanes and saturated compounds do not. Therefore, the correct substance is ethene, option d.

MUF0042 Chemistry Unit 2 - Semester 2, 2025 3.8 Quiz: Types of Reactions

Which of the following substances would decolourise bromine? .

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