Reactions or alkenes 2

• What is the term for the reaction of alkenes with water?

  Hydration
• What is produced when ethene reacts with water?

  Ethanol
• What form must water be in for the hydration reaction?

  Steam
• What temperature is required for the hydration of ethene?

  300 degrees Celsius
• What pressure is required for the hydration of ethene?

  70 atmospheres
• What catalyst is used in the hydration of ethene?

  Phosphoric acid
• Why is the hydration reaction of ethene reversible?

  Unreacted ethene and steam are recycled
• What is the product when ethene reacts with chlorine gas?

  Dichloroethane
• How do halogens react with alkenes?

  Rapidly, adding across the double bond
• What is produced when ethene reacts with bromine?

  Dibromoethane
• What is produced when ethene reacts with iodine?

  Diiodoethane
• What are the key conditions for the hydration of ethene?

  • Water must be in steam form
  • Temperature: 300 degrees Celsius
  • Pressure: 70 atmospheres
  • Catalyst: Phosphoric acid
• What are the reactions of alkenes with halogens?

  • Ethene + Chlorine → Dichloroethane
  • Ethene + Bromine → Dibromoethane
  • Ethene + Iodine → Diiodoethane
• What should students focus on regarding alkenes for exams?

  • Reactions with water (hydration)
  • Reactions with halogens
  • Conditions for each reaction