DP Chemistry (last assessment 2024)

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Question 21M.2.hl.TZ2.4f

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.hl.TZ2.4f
Level hl Paper 2 Time zone TZ2
Command term Explain Question number f Adapted from N/A
f.
[Maximum mark: 2]
21M.2.hl.TZ2.4f

Organic chemistry can be used to synthesize a variety of products.

(f)

Explain why the major organic product is 2-bromo-2-methylbutane and not 2-bromo-3-methylbutane.

[2]

Markscheme

«2-bromo-2-methylbutane involves» formation of more stable «tertiary» carbocation/intermediate
OR
«2-bromo-3-methylbutane involves» formation of less stable «secondary» carbocation/intermediate ✓

«intermediate» more stable due to «increased positive» inductive/electron-releasing effect of extra –R/alkyl group/–CH3/methyl ✓


Do not award marks for quoting Markovnikov’s rule without any explanation.

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