PR - CI12.2 Alkenes

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  • Created by: Gemma
  • Created on: 09-11-12 10:39
  • Have a C=C double bond
  • Unsaturated hydrocarbons
  • With ending -ene eg. ethene
  • BP increases with chain length
  • General formula - CnH2n
  • Can get cycloalkenes which are dienes eg. penta-1,3-diene

Shapes of Alkenes

  • Flat molecule with bond angles of 120 degrees
  • Tetrahedral arrangement around non-double bonded C
  • Planar arrangement around C=C

Chemical Reactions

  • 4 electrons around the C=C give a higher than normal density of electrons (-ve charge)
  • +ve ions are attracted to the C=C and can accept a pair


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