Which sequence below would be appropriate for the synthesise of an ester?
1. Heat the mixture
2. Add three drops of concentrated sulfuric acid
3. Add 1 mL of ethanol
4. Add 1 mL of ethene
5. Add 1 mL of ethanoic acid
6. Distil or recrystallise
7. Add three drops of phenolphtalein indicator
3. Add 1 mL of ethanol
5. Add 1 mL of ethanoic acid
2. Add three drops of concentrated sulfuric acid
1. Heat the mixture
6. Distil or recrystallise
Note: Adding ethene (4) is not necessary for synthesis of an ester. Adding phenolphthalein indicator (7) is also not necessary.