6E: Alcohols
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Reaction of alcohols with oxygen in air: Product.
Carbon dioxide and water
Describe the reaction: Alcohol -> Carbon dioxide + Water
React with oxygen in air
Reaction of alcohols with PCl5: Products, Observation.
Chloroalkane, POCl3 and HCl, Steamy white fumes
Describe the reaction: Alcohol -> chloroalkane
React with PCl5, Produces POCl3 and HCl, Steamy white fumes.
Describe the test for HCl (g)
Hold a rod covered in concentrated ammonia near the fumes, - produces dense white smoke
Reaction of alcohols with potassium bromide: Conditions, Product.
50% concentrated sulfuric acid, heat under reflux, Bromoalkane.
Describe the reaction: Alcohol -> bromoalkane
React with 50% concentrated sulfuric acid and potassium bromide, Heat under reflux.
Reaction of alcohols with red phosphorus and iodine: Conditions, Product, Equation.
Warm conditions, damp phosphorus, Iodoalkane, 3 Alcohol + PI3 -> 3 Iodoalkane + H3PO3
Describe the reaction: Alcohol -> iodoalkane
React with damp red phosphorus and iodine, Warm conditions.
Reaction of primary alcohols with potassium dichromate(VI): Conditions, Colour change, Products.
Acidified potassium dichromate(VI), Orange -> green, Partial oxidation: Distill immediately, Aldehyde. Complete oxidation: Heat under reflux, Carboxylic acid.
Describe the reaction: Alcohol -> aldehyde
Primary alcohol reacts with acidified potassium dichromate(VI), Distill immediately. Colour change orange -> green
Describe the reaction: Alcohol -> carboxylic acid
Primary alcohol reacts with acidified potassium dichromate(VI), Heat under reflux. Colour change orange -> green
Reaction of secondary alcohols with potassium dichromate(VI): Conditions, Colour change, Product.
Acidified potassium dichromate(VI), heat under reflux, Orange -> green, Ketone.
Describe the reaction: Alcohol -> ketone
Secondary alcohol reacts with acidified potassium dichromate(VI), Heat under reflux. Colour change orange -> green
Reaction of tertiary alcohols with potassium dichromate(VI): Conditions, Colour change, Product.
Resists oxidation, no reaction. Stays orange
Describe the test for aldehydes.
Warm with Fehling’s solution, - Blue solution -> Red precipitate
Reaction of alcohols with phosphoric acid: Conditions, Product.
Concentrated acid, heat under reflux, Alkene.
Describe the reaction: Alcohol -> alkene
React with concentrated phosphoric acid, Heat under reflux.
What is the purpose of anti-bumping granules?
Encourages the formation of small bubbles, which allows for smooth boiling.