Which of the following substances would decolourise bromine? .

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BlackTom AI · Accepted Answer

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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