AQA AS CHEMISTRY 7404 2 PAPER 2 EXAM
STUDY GUIDE 2026 COMPLETE QUESTIONS
AND CORRECT SOLUTIONS
⩥ Draw the mechanism for the reaction of a nucleophile (either with
ammonia or water) with bromoethane.
State what type of mechanism this is. Answer: Nucleophilic Substitution
⩥ Draw the mechanism for the synthesis of bromoethane from ethene.
State what mechanism this is. Answer: Electrophilic Addition
⩥ Draw the mechanism for making ethene from bromoethane
State what mechanism this is. Answer: Elimination
⩥ Draw the mechanism for making ethene from ethanol.
State what mechanism this is. Answer: Elimination
⩥ Draw the mechanism for making prop-2-ene from propan-2-ol.
, State what mechanism this is. Answer: Elimination
⩥ During an elimination reaction, where must the arrows go? Answer: 1)
From the middle of the lone pair to a hydrogen that is attached to the
carbon next to the C-X bond.
2) From the middle of the C-X bond to the halogen atom
⩥ What small molecule is always produced from elimination reactions?
Answer: Water
⩥ How can you tell that the mechanism will be elimination? Answer: 1)
There is a halogenoalkane and you are removing a hydrogen atom from
it to make an alkene.
2) The halogenoalkane is tertiary or secondary
3) If there is a hydroxide ion, it will be hot and in ethanol.
⩥ A species (called Y) has a lone pair of electrons and is being reacted
with a halogenoalkane to produce an alkene. What is Y acting as?
Answer: A base
STUDY GUIDE 2026 COMPLETE QUESTIONS
AND CORRECT SOLUTIONS
⩥ Draw the mechanism for the reaction of a nucleophile (either with
ammonia or water) with bromoethane.
State what type of mechanism this is. Answer: Nucleophilic Substitution
⩥ Draw the mechanism for the synthesis of bromoethane from ethene.
State what mechanism this is. Answer: Electrophilic Addition
⩥ Draw the mechanism for making ethene from bromoethane
State what mechanism this is. Answer: Elimination
⩥ Draw the mechanism for making ethene from ethanol.
State what mechanism this is. Answer: Elimination
⩥ Draw the mechanism for making prop-2-ene from propan-2-ol.
, State what mechanism this is. Answer: Elimination
⩥ During an elimination reaction, where must the arrows go? Answer: 1)
From the middle of the lone pair to a hydrogen that is attached to the
carbon next to the C-X bond.
2) From the middle of the C-X bond to the halogen atom
⩥ What small molecule is always produced from elimination reactions?
Answer: Water
⩥ How can you tell that the mechanism will be elimination? Answer: 1)
There is a halogenoalkane and you are removing a hydrogen atom from
it to make an alkene.
2) The halogenoalkane is tertiary or secondary
3) If there is a hydroxide ion, it will be hot and in ethanol.
⩥ A species (called Y) has a lone pair of electrons and is being reacted
with a halogenoalkane to produce an alkene. What is Y acting as?
Answer: A base
