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Which statement is correct about the molecule shown? A It reacts with HBr in an electrophilic substitution reaction - AQA - A-Level Chemistry - Question 10 - 2018 - Paper 3
Question 10
Which statement is correct about the molecule shown? A It reacts with HBr in an electrophilic substitution reaction. B It reacts with NaBH₄ in a nucleophilic add... show full transcript
Worked Solution & Example Answer:Which statement is correct about the molecule shown? A It reacts with HBr in an electrophilic substitution reaction - AQA - A-Level Chemistry - Question 10 - 2018 - Paper 3
Step 1
D It reacts with KCN in a nucleophilic substitution reaction.
Answer
The correct statement about the molecule shown is option D: it reacts with KCN in a nucleophilic substitution reaction.
This molecule contains a bromine atom, which is a good leaving group. When it reacts with KCN, the cyanide ion (CN⁻) acts as a nucleophile that can attack the carbon atom attached to bromine. This process leads to the substitution of bromine with the cyanide group, resulting in a nitrile.
In contrast, options A, B, and C describe reactions that do not apply to this particular molecule due to its structure and the nature of its functional groups.