Physical properties
2 marks · NormalState the general formula for alkenes and give the displayed formula for propene.
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Also accept: H2C=CH–CH3; CH2=CHCH3
Common mistakes: Giving displayed formula of propane; Incorrect placement of double bond
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Marking points
B1 · 1 mark · States general formula: CnH2n
B2 · 1 mark · Correct displayed formula for propene
Worked solution
The general formula for alkenes is CnH2n.
The displayed formula for propene is: H2C=CH–CH3