Addition Reactions of alkenes

• What are alkenes classified as?

  Unsaturated hydrocarbons
• What does the term "unsaturated" in alkenes refer to?


  It means they contain at least one carbon-carbon double bond
• What is the functional group of alkenes?

  Carbon-carbon double bond
• Why can alkenes undergo addition reactions?

  Because the carbon-carbon double bond can open up to bond with other atoms
• What are the three types of addition reactions of alkenes covered in the video?

  • Addition with hydrogen
  • Addition with water
  • Addition with halogens
• What is the alkene used in the reaction with hydrogen in the video?

  Propene
• What happens when hydrogen gas is added to propene in the presence of a catalyst?

  The double bond breaks and hydrogen atoms bond to the carbon atoms
• What is the product formed when propene reacts with hydrogen?

  Propane
• How is propane classified after the reaction with hydrogen?

  It is classified as an alkane
• What alkene is used in the reaction with water in the video?

  Ethene
• What are the conditions required for the reaction of ethene with water?

  Presence of a catalyst at high temperatures
• What happens to the water molecule during the reaction with ethene?

  The water molecule splits into a hydrogen atom and an OH group
• What is the product formed when ethene reacts with water?

  Ethanol
• Why is ethanol significant in industry?

  It is used in alcoholic drinks and some industrial processes
• How is unreacted ethene separated from ethanol and water after the reaction?

  By cooling down the mixture to condense water and ethanol
• What method is used to separate ethanol from water?

  Fractional distillation
• How does fractional distillation work in separating ethanol and water?

  Ethanol boils first due to its lower boiling point and evaporates
• What is the common halogen used in the reaction with alkenes in the video?

  Bromine
• What happens when bromine is added to ethene?

  They react to form dibromoethane and the orange color disappears
• Why is the reaction of bromine with alkenes significant?

  It is used to distinguish alkenes from alkanes
• What happens when bromine water is added to alkanes?

  The solution remains orange because alkanes do not react
• What is the summary of the reactions of alkenes with bromine and their significance?

  • Alkenes can decolorize bromine water from orange to colorless.
  • Alkanes do not react with bromine, so the solution remains orange.
  • This reaction is used to distinguish between alkenes and alkanes.