alkenes and addition of bromine

• What will you learn in this tutorial?

  How to test for the presence of an alkene
• What type of bond do alkenes have?

  Carbon-carbon double covalent bond
• Why are alkenes considered unsaturated hydrocarbons?

  They can add atoms due to double bonds
• What happens during an addition reaction of alkenes?

  The double bond breaks and new atoms join
• What does the term unsaturated imply about an alkene molecule?

  It is not bonded to the maximum number of atoms
• How do alkanes differ from alkenes in terms of saturation?

  Alkanes are saturated with no double bonds
• What is the appearance of both alkanes and alkenes?

  They are both colorless liquids
• What is bromine water and its appearance?

  It is an orange or yellowy brown solution
• How does bromine water help test for alkenes?

  It reacts with alkenes to change color
• What happens when hexine (an alkene) is added to bromine water?

  The solution goes from brown to colorless
• What is formed when an alkene reacts with bromine water?

  A dibromoalkane that is colorless
• What occurs when an alkane is added to bromine water?

  No reaction occurs; solution remains brown
• What are the key differences between alkenes and alkanes regarding reactions with bromine water?

  • Alkenes:
  • Unsaturated
  • React with bromine water
  • Solution turns colorless
  • Alkanes:
  • Saturated
  • No reaction with bromine water
  • Solution remains brown
• What is the displayed formula of hexane and hexine?

  They are both colorless liquids
• What does the term "dibromoalkane" refer to?

  A product formed from alkene and bromine
• Why does the solution remain brown when an alkane is added to bromine water?

  Because no reaction occurs with alkanes