organic synthesis and analysis

• how do you get from an alkene to a polyalkene


  high pressure catalyst
• how do you get from an alkene to a dihalogenoalkane?


  electrophillic addition - $Br_2\$or $Cl_2$
• how to you get from a dihalogenoalkane to a diol?


  nucleophillic subsitution - aqueous KOH, heat under reflux
• how do you get from an alkene to a halogenoalkane?


  electrophillic addition - HCl or HBr at room temp