Propene reacts with bromine water. Which observation and product are expected?
Answer and explanation
Correct answer: B. The orange-brown colour disappears, and 1,2-dibromopropane forms by addition
- Step 1: Propene has a C=C double bond, which reacts with Br2 in an addition reaction.
- Step 2: Both bromine atoms add across the double bond, giving 1,2-dibromopropane.
- Step 3: Bromine is used up, so the orange-brown colour disappears.
Answer
decolourises; 1,2-dibromopropane by addition.
Why not the others: Colour remaining means no reaction; substitution is how alkanes react under UV; propane would need hydrogen, not bromine.
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