Alkenes 0.0 / 5 ? Chemistryorganic chemistryASAQA Created by: Joseph FurnivalCreated on: 27-04-18 13:31 what is the general formula of an alkene CnH2n 1 of 22 is an alkene saturated or unsaturated unsaturated 2 of 22 what is the bond angle of a C=C double bond 120 3 of 22 What does a double covalent bond consist of A sigma bond and a pi bond 4 of 22 Why are pi bonds vulnerable to electrophiles They are exposed and have a high electron density 5 of 22 what is an electrophile an electron pair acceptor 6 of 22 what is an addition reaction a reaction where two molecules are added together to make one 7 of 22 Describe briefly the reaction the reaction of bromine with alkenes Br2 molecule approaches the alkene Pi bond electrons repel br2 molecules inducing a dipole and Br2 becomes polar. 8 of 22 Describe briefly the reaction of alkenes with hydrogen bromide There is a dipole in HBr because of electronegativity the partially positive H+ is attracted to the more electron rich pi bond 9 of 22 What is Markownikoffs rule In most cases bromine will be attracted to the carbon with the least hydrogens around it. 10 of 22 what is the order of stabilities for carbocations tertiary>secondary>primary 11 of 22 how is the major product formed in electrophilic addition It is by the more stable carbocation 12 of 22 Describe briefly the reaction of alkenes with sulphuric acid The alkene is changed into alkyl hydrogensulphate this is then hydrolysed to form an alcohol 13 of 22 what is the H2SO4 in the reaction It is a catalyst as it is regenerated 14 of 22 describe the test for alkenes using bromine water Bromine water will decolourise in the presence of a double bond 15 of 22 how are addition polymers formed formed from alkenes and substituted alkenes 16 of 22 when should you add a lower case n when drawing addition polymers when there are many repeating units 17 of 22 how should you draw an addition polymer draw out the monomers with groups of atoms arranged around the double bond 18 of 22 why are polyalkenes unreactive it is due to the long C-C and C-H bonds. 19 of 22 describe some of the properties of polychloroethene waterproof,electrical insulator and doesn't react with acids 20 of 22 what are the uses of of polychloroethene used to make window frames and guttering 21 of 22 what happens if a plasticiser is added to polychloroethene intermolecular forces are weakened which allows the chain to move more easily 22 of 22
Basic concepts and hydrocarbons, Alcohols, Halogenoalkanes and analysis, Energy 1.0 / 5 based on 2 ratings
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