Which of the following substances would decolourise bromine? .

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BlackTom AI · Accepted Answer

To approach this question, consider how bromine water behaves with different types of hydrocarbons.
Option a: 1,2-dibromoethane. This compound is saturated with bromine atoms on adjacent carbons and contains no carbon–carbon double bond. Bromine water will not decolourise further because there is no C=C to react with, so this answer is incorrect.
Option b: ethane. Ethane is a saturated alkane and lacks a carbon–carbon double bond. Bromine water does not react with alkanes under normal conditions, so there is no decolourisation here. This makes this option incorrect.
Option c: ethene. Ethene has a carbon–carbon double bond (C=C). Bromine adds across the double bond in an electrophilic addition reaction, rapidly removing the orange-brown colour of bromine water. This is the classic test for unsaturation, so this option is correct.
Option d: methane. Like ethane, methane is an alkane and lacks a C=C. It does not react with bromine water to decolourise it, so this option is incorrect.

MUF0042 Chemistry Unit 2 - Semester 1, 2025 3.8 Quiz: Types of Reactions

Which of the following substances would decolourise bromine? .

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