The test for unsaturated compounds
2 marks · HardGive the structural formula of the product formed when hex-2-ene reacts with bromine. Name the type of reaction that occurs.
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The product is CH3CHBrCHBrCH2CH2CH3. The reaction is an addition reaction.
Also accept: CH3CHBrCHBrCH2CH2CH3; addition reaction
Common mistakes: Giving substitution instead of addition; Incorrect structural formula (wrong position for Br)
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Marking points
B1 · 1 mark · Correct structural formula of the product: CH3CHBrCHBrCH2CH2CH3
B2 · 1 mark · States addition reaction
Worked solution
When hex-2-ene (CH3CH=CHCH2CH2CH3) reacts with bromine (Br2), each Br adds across the double bond at carbons 2 and 3.
This is an addition reaction.