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An addition reaction is when the _____ or ______ covalent bond opens and the other reactant adds on
How many products are formed in an addition reaction?
How many times do alkynes undergo an addition reaction?
When alkenes react with water in an addition reaction, ________ are formed?
What is hydration?
- The addition of water to one molecule
- eg ethene + water → ethanol
What is the opposite reaction to hydration?
- Dehydration - the removal of water from one molecule
- eg ethanol → ethene + water
What is the catalyst in dehydration?
What can oxidation be classed as?
- loss of electrons
- gain of oxygen
- loss of hydrogen
Can alkanols be completely oxidised?
Name two oxidising agents
- Acidified potassium dichromate
- Hot copper (II) oxide
What is the colour change in hot copper (II) oxide?
black → brown
What happens to a primary alkanol when it is oxidised?
Primary alkanol → alkanal → alkanoic acid
What happens to a secondary alkanol when it is oxidised?
Secondary alkanol → alkanone
What happens to a tertiary alkanol when it is oxidised?
Nothing - there is no reaction