| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.hl.TZ2.21 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Predict | Question number | 21 | Adapted from | N/A |
Question
The structures of morphine, diamorphine and codeine are given in section 37 of the data booklet.
Methadone is used to treat heroin addiction. 1H NMR spectroscopy can be used to study its structure.
Predict the number of different hydrogen environments in the molecule ignoring the benzene rings.
[1]
c.i.
Predict the chemical shift and the splitting pattern seen for the hydrogens on the carbon atom circled in the diagram. Use section 27 of the data booklet.
[2]
c.ii.
Markscheme
6
[1 mark]
c.i.
Chemical shift:
2.2–2.7 «ppm»
Splitting pattern:
quartet/q
[2 marks]
c.ii.
Examiners report
[N/A]
c.i.
[N/A]
c.ii.
Syllabus sections
Core » Topic 11: Measurement and data processing » 11.3 Spectroscopic identification of organic compounds
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