CAIE A-Level Chemistry A2 29.2.1 Terminol…h Types

[Maximum number: 3]

The reaction of phenylethanone with 1,4-dibromobutane, $\mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}$ , in the presence of $\mathrm{FeBr}_{3}$ is shown in Fig. 6.2.
phenylethanone

Fig. 6.2

The mechanism of this reaction is similar to that of the alkylation of benzene.

Complete the mechanism in Fig. 6.3 for the reaction of phenylethanone with $\mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2}^{+}$ ions.

Include all relevant curly arrows and charges.
Draw the structure of the organic intermediate.

Fig. 6.3

Figure for Answer to Question 1 — CAIE A-Level Chemistry A2

$\text { product } \quad+\ldots \mathrm{H}^{+}$

M1 curly arrow from inside the hexagon towards $\mathrm{C}^{+}$

M2 structure of the intermediate

M3 curly arrow from C-H bond into the ring AND $\mathrm{H}^{+}$

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CAIE A-Level Chemistry A2 29.2.1 Terminology Associated with Types Topic Practice

Question 1