Alkenes and geometric isomerismEdexcel International A Level Chemistry: Mind map

Exam questions on Alkenes and geometric isomerism

1. A student studies hydrocarbons with a C=C double bond and builds models of several of them to compare their structures.
   Describe how the carbon–carbon double bond in an alkene is made up of a sigma bond and a pi bond.2 marks
2. A chemist is explaining why some alkenes exist as pairs of isomers that cannot be interconverted at room temperature, and how these isomers are named.
   Explain why pent-1-ene does not show geometric isomerism.2 marks
3. In an A Level class, but-2-ene and a halogenated alkene are used to illustrate geometric isomerism and the E-Z naming system.
   But-2-ene, CH₃CH=CHCH₃, shows geometric isomerism. Explain why, and name the two isomers using the E-Z system.3 marks