Unsaturated hydrocarbons
2 marks · NormalDraw the displayed formula of ethene. Name the type of bond that makes ethene an unsaturated hydrocarbon.
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Must show: Displayed formula for ethene as H2C=CH2, Names 'carbon–carbon double bond' or 'C=C bond'
Common mistakes: Omitting double bond; Confusing single and double bonds
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Marking points
B1 · 1 mark · Draws the correct displayed formula of ethene.
B2 · 1 mark · Names the C=C double bond as the bond that makes ethene unsaturated.
Worked solution
The displayed formula for ethene is:
It is unsaturated due to the presence of a carbon–carbon double bond (C=C bond).