The structures of four organic compounds are shown below. Which compounds decolourise bromine water?
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Answer:
The compounds 2 and 4 decolourise Br2 water.
Explanation:
Br2 water is the test for unsaturation. Br2 is brown liquid, when it reacts with unsaturated compounds it becomes colourless.
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The compounds that can decolourise bromine water are:
(2) CH2=CH2
(4) CH3-CH=CH2
- Bromine water is a coloured compound that can be decolourised by alkenes.
- It is also used as a test for unsaturation.
- Here, (1) is a carboxylic acid, (2) is an alkene, (3) is an alkane and (4) is also an alkene.
- So, only (2) and (4) will decolourise the bromine water.
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