The reaction of bromine with benzene in the presence of FeBr3 follows the mechanism of:
Correct answer: B. Electrophilic substitution
- A. Electrophilic addition
- B. Electrophilic substitution
- C. Nucleophilic substitution
- D. Nucleophilic addition
Explanation
Benzene has an extended delocalised pi system above and below the ring which makes it highly attracted to electron-deficient species, which is why it readily undergoes electrophilic substitution.electrophilic substitution because an electrophile (H+) is being substituted from the reactant (benzene ring).
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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