Mechanisms

• Alcohol to Alkene is

  Dehydration
• Define dehydration

  Removing the OH from a molecule water,
• Reagent and conditions for OH- =

  Concentrated phosphoric acid or sulfuric acid, heated gently under reflux, elimination
• How to get a primary alcohol to aldehyde (reagent)

  Distillation, potassium dichromate and dilute sulphuric acid
• Colour change in oxidation of primary alcohol to aldehyde

  Orange to green
• Aldehyde to COOH (reagent)

  Heat under reflux, potassium dichromate and dilute sulphuric acid
• Alkene to alcohol

  Hydration
• Condition for hydration

  High temperature and pressure, concentrated acid, H3PO4, H2SO4, continuous process, fast, pure