Which compound can quickly decolourise bromine water?
Answer and explanation
Correct answer: Ethene
Bromine water is a common test for carbon-carbon unsaturation. Ethene contains a C=C double bond, which reacts readily with bromine in an addition reaction; bromine is consumed and its orange-brown colour disappears. Therefore option A is correct. Ethane and methane are saturated hydrocarbons and do not rapidly decolourise bromine water under ordinary test conditions. Sodium chloride is ionic and does not provide an unsaturated bond.
Frequently asked questions
What is the correct answer to this question?
Ethene
Why is this the correct answer?
Bromine water is a common test for carbon-carbon unsaturation. Ethene contains a C=C double bond, which reacts readily with bromine in an addition reaction; bromine is consumed and its orange-brown colour disappears. Therefore option A is correct. Ethane and methane are saturated hydrocarbons and do not rapidly decolourise bromine water under ordinary test conditions. Sodium chloride is ionic and does not provide an unsaturated bond.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Carbon and its Compounds. Topic: Hydrocarbons.
