AP EAMCET · Chemistry · Alcohols Phenols and Ethers
Which reaction of ethanol will decolourise bromine water?
- A \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+\mathrm{HBr} \longrightarrow \mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{H}_2 \mathrm{O}\)
- B \(2 \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH} \xrightarrow[413 \mathrm{~K}]{\mathrm{H}^{+}} \mathrm{C}_2 \mathrm{H}_5-\mathrm{O}-\mathrm{C}_2 \mathrm{H}_5+\mathrm{H}_2 \mathrm{O}\)
- C \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+\mathrm{Na} \longrightarrow \mathrm{C}_2 \mathrm{H}_5 \mathrm{ONa}+\frac{1}{2} \mathrm{H}_2 \mathrm{O}\)
- D \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH} \xrightarrow[443 \mathrm{~K}]{\mathrm{H}^{+}} \mathrm{C}_2 \mathrm{H}_4+\mathrm{H}_2 \mathrm{O}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH} \xrightarrow[443 \mathrm{~K}]{\mathrm{H}^{+}} \mathrm{C}_2 \mathrm{H}_4+\mathrm{H}_2 \mathrm{O}\)
Step-by-step Solution
Detailed explanation
One of the product in this reaction is ethene, an unsaturated hydrocarbon. It decolourises bromine water. Bromine solution is the classic test for the detection of unsaturation. A few drops of bromine water to the test tube with the ethanol produce reddish-brown colour.
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