DP Chemistry (last assessment 2024)

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Question 17N.3.sl.TZ0.17b.i

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.3.sl.TZ0.17b.i
Level sl Paper 3 Time zone TZ0
Command term Outline Question number b.i Adapted from N/A
b.i.
[Maximum mark: 1]
17N.3.sl.TZ0.17b.i

Some analgesics are derived from compounds found in plants.

(b.i)

The strong analgesics morphine and codeine are opiates. Outline how codeine can be synthesized from morphine. The structures of morphine and codeine are in section 37 of the data booklet.

[1]

Markscheme

react with CH3I/methyl iodide «in alkaline solution»

Accept “react with CH3Cl/methyl chloride” OR “react with methyl halide”.

Accept name or formula of a suitable specific methylating reagent (eg trimethylphenylammonium chloride etc.).

Accept “hydroxy/alcohol” but not “hydroxide” for “hydroxyl”.

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