IB Chemistry HL 3.4.11 Hl Electrophilic Addition Mechanisms Questions

Use real HL exam questions to draw electrophilic addition to symmetrical alkenes, represent heterolytic bond breaking and intermediates, and complete the product-forming nucleophile step.

Exam points

Start the first curly arrow at the alkene π bond and direct it to H or another electrophile in the electrophilic-addition step.
Show heterolytic bond breaking and the correct charged carbocation or halonium intermediate with the appropriate structural connectivity.
Complete nucleophilic attack on the intermediate with every curly arrow beginning at an electron pair and show the correct addition product.

[Maximum number: 3]

Organic compounds have many industrial applications.

An alkene such as ethene can be used as starting material for a range of compounds.

Describe the mechanism of this reaction, using curly arrows to represent the movement of electron pairs.

Figure for Answer to Question IB Chemistry HL 3.4.11 Hl Electrophilic Addition Mechanisms Questions question 1 — IB Chemistry HL

curly arrow from C=C bond to Br AND curly arrow showing Br-Br bond breaking

carbocation with charge on correct atom

curly arrow from lone pair/negative charge on $\mathrm{Br}^{-}$ to $\mathrm{C}^{+}$

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IB Chemistry HL 3.4.11 Hl Electrophilic Addition Mechanisms Questions question 1