The test for unsaturated compounds
2 marks · NormalState the overall type of reaction that occurs when bromine water reacts with ethene, and give the name of the organic product formed.
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Addition reaction; 1,2-dibromoethane
Also accept: addition; 1,2-dibromoethane; addition reaction; 1,2-dibromoethane; addition; 1,2-dibromoethane (or equivalent correct name with correct numbers); addition reaction; 1,2-dibromoethane (structural or systematic name accepted)
Common mistakes: substitution; 1,2-dibromomethane
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States 'addition' or 'addition reaction' as the type of reaction.
B2 · 1 mark · Names the organic product as 1,2-dibromoethane (accept correct structural or systematic name).
Worked solution
The reaction of bromine water with ethene is an addition reaction. The product formed is called 1,2-dibromoethane.