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Which compound decolourises bromine water in the absence of sunlight? A CH₂CH₂CH₂Br B C D CH₂CH₂CH₂CH₃ - AQA - A-Level Chemistry - Question 24 - 2020 - Paper 3
Question 24
Which compound decolourises bromine water in the absence of sunlight? A CH₂CH₂CH₂Br B C D CH₂CH₂CH₂CH₃
Worked Solution & Example Answer:Which compound decolourises bromine water in the absence of sunlight? A CH₂CH₂CH₂Br B C D CH₂CH₂CH₂CH₃ - AQA - A-Level Chemistry - Question 24 - 2020 - Paper 3
Step 1
D CH₂CH₂CH₂CH₃
Answer
The correct answer is D CH₂CH₂CH₂CH₃. This compound is an alkane, which can react with bromine under specific conditions, even in the absence of sunlight. It will effectively decolourise bromine water through a substitution reaction, where the -Br group can substitute for a hydrogen atom in the alkane.