alkenes

• Alkene

  Unsaturated hydrocarbons
• General formula

  CnH2n
• Alkene


  • Ethene
  • Propene
• The arrangement of the bonds around >C=C< is planar and has a bond angle of 120°
• 1. Z isomers are formed when there is restricted rotation around the C=C double bond and there are two different groups/atoms at either end of the double bond
• 1. Z-Isomer

  • Z-But-2-ene
  • E-But-2-ene
• Reaction of alkenes with bromine/chlorine

  
  

  1. Functional group change: alkene dihaloalkane

  2nd reagent: bromine

  3. Conditions: Room temperature (not in UV light)

  4. Mechanism: Electrophilic addition

  5. Type of reagent: Electrophile, Br+

  6. Type of bond cleavage: Heterolytic
• Reaction of hydrogen bromide with alkenes

  
  

  1. Functional group change: alkene haloalkane

  2. Reagent: HCl or HBr

  3. Conditions: Room temperature

  4. Mechanism: Electrophilic addition

  5. Type of reagent: Electrophile, H+
• Addition Polymer

  • Polyethene
  • Polypropene