This question is about alkenes.
Ethene, C2H4\mathrm{C_{2}H_{4}}C2H4, and propene, C3H6\mathrm{C_{3}H_{6}}C3H6, are the first two members of the alkene homologous series.
A student has two unlabelled bottles. One contains hexane and the other contains hexene.
Describe a test the student can do to find out which bottle contains hexene.
Give the result for both liquids.
Ethene reacts with hydrogen to make ethane.
Name the type of reaction.
Propene reacts with hydrogen in the same way.
Give the name and the formula of the product.
Ethene reacts with steam to make an alcohol.
Write the formula of the alcohol.
Propene, CH2=CHCH3\mathrm{CH_{2}=CHCH_{3}}CH2=CHCH3, is the monomer used to make the polymer poly(propene).
State the feature of a propene molecule that allows it to form an addition polymer.
Which of these is the repeat unit of poly(propene)?
A −CH2−CH2−\mathrm{-CH_{2}-CH_{2}-}−CH2−CH2−
B −CH2−CH(CH3)−\mathrm{-CH_{2}-CH(CH_{3})-}−CH2−CH(CH3)−
C −CH=CH(CH3)−\mathrm{-CH=CH(CH_{3})-}−CH=CH(CH3)−
D −CH2−CH2−CH2−\mathrm{-CH_{2}-CH_{2}-CH_{2}-}−CH2−CH2−CH2−
Write the letter.
Chloroethene, CH2=CHCl\mathrm{CH_{2}=CHCl}CH2=CHCl, also forms an addition polymer.
Write the repeat unit of this polymer.
The polymer PTFE has the repeat unit −CF2−CF2−\mathrm{-CF_{2}-CF_{2}-}−CF2−CF2−.
Write the structural formula of the monomer used to make PTFE.
63 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.