DP Chemistry (last assessment 2024)

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Question 21N.2.hl.TZ0.b(iii)

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Date November 2021 Marks available [Maximum mark: 4] Reference code 21N.2.hl.TZ0.b(iii)
Level hl Paper 2 Time zone TZ0
Command term Apply, Explain Question number b(iii) Adapted from N/A
b(iii).
[Maximum mark: 4]
21N.2.hl.TZ0.b(iii)

Hybridization of hydrocarbons affects their reactivity.

Explain the mechanism of the reaction between but-1-ene with hydrogen iodide, using curly arrows to represent the movement of electron pairs.

[4]

Markscheme

curly arrow going from C=C to H of HI AND curly arrow showing I leaving ✔

representation of carbocation ✔

curly arrow going from lone pair/negative charge on I– to C+ ✔

2-iodobutane formed ✔

 

Penalize incorrect bond, e.g. –CH–H3C or –CH3C once only.

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