What feature of alkenes makes them more reactive than alkanes? They have lower boiling pointsThey have longer chainsThey have at least one carbon-carbon double bondThey are saturated2Which of the following is butene? C2H4C4H8C4H10C3H63What is the balanced equation for the complete combustion of ethene? 2C2H4 + 2O2 → 2CO2 +2H2OC2H4 + 3O2 → 2CO2 + 2H2OC2H6 + 3O2 → 2CO2 + 2H2OC2H4 + O2 → CO2 + H2O4Alkenes can react with hydrogen, halogens or water. What type of reactions are these?ReductionAdditionCombustionOxidation5In industry, how is the percentage of unsaturated fat in an oil reduced to turn it into a spreadable solid?By reacting it with hydrogenBy reacting it with bromineBy reacting it with oxygenBy reacting it with steam6Ethene reacts with steam to form ethanol. What is the formula of ethanol?C2H6C2H4 C3H7OHC2H5OH

The alkenes are unsaturated hydrocarbons. They form a homologous series, the members ofwhich have the same chemical properties.They undergo addition reactions and are easily oxidised.(a) The following hydrocarbons are isomers.CH 3 CH CH CH 2CH 3CH 3 CH 2 CH 2 CH CH 2(i) Explain why these two hydrocarbons are isomers................................................................................................................................................................................................................................................................... [2](ii) Give the structural formula of another hydrocarbon which is isomeric with the above.[1](b) Give the structural formula and name of each of the products of the following additionreactions.(i) ethene and brominestructural formula of productname of product ................................................................................................... [2](ii) propene and hydrogenstructural formula of productname of product ................................................................................................... [2](iii) but-1-ene and waterstructural formula of productname of product ................................................................................................... [2]PhysicsAndMathsTutor.com

Combustion of alkane will produceGroup of answer choicesCarbon dioxide, water, and heatWaterHeatCarbon dioxide

Alkanes and alkenes are both series of hydrocarbons.(a) (i) Explain the term hydrocarbon................................................................................................................................................................................................................................................................... [1](ii) What is the difference between these two series of hydrocarbons?..............................................................................................................................................................................................................................................

Explain why propanol has higher boiling point than that of the hydrocarbon, butane?

(c) Alkenes such as butene and ethene are more reactive than alkanes.Alkenes are used in the petrochemical industry to make a range of products, whichincludes polymers and alcohols.(i) Dibromoethane is used as a pesticide. Complete the equation for its preparationfrom ethene.C C + B 2 →HHHH[1](ii) The structural formula of a poly(alkene) is given below.nCCH 3CCH 3H HDeduce the structural formula of its monomer.[2](iii) How is butanol made from butene, CH 3 – CH 2 – CH = CH 2 ? Include an equation inyour answer................................................................................................................................................................................................................................................................... [2](iv) Cracking changes alkanes into alkenes. How could an alkene be converted into analkane? Include an equation in your answer................................................................................................................................................................................................................................................................... [2]PhysicsAndMathsTutor.com