Benzene, $$\(\mathrm{C}_{6} \mathrm{H}_{6}\)$$, can be obtained from crude oil. Benzene reacts with bromine, in the presence of a suitable catalyst, forming bromobenzene as one product. In the presence of the catalyst, bromine can be considered to form the electrophile $$\(\mathrm{Br}^{+}\)$$. Complete the mechanism by which benzene reacts with $$\(\mathrm{Br}^{+}\)$$, using curly arrows to show the movement of electron pairs.

Chemistry
IGCSE&ALevel
CAIE
Exam No:9701_w20_qp_43 Year:2020 Question No:8(a)(ii)

Answer:



Knowledge points:

30.1.1.1 substitution reactions with Cl 2 and with Br2 in the presence of a catalyst, AlCl 3 or Al Br3, to form halogenoarenes (aryl halides)
30.1.2.1 as exemplified by the formation of nitrobenzene and bromobenzene
30.1.2.2 with regards to the effect of delocalisation (aromatic stabilisation) of electrons in arenes to explain the predomination of substitution over addition

Solution:

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