| Date | May 2013 | Marks available | 2 | Reference code | 13M.3.sl.TZ2.A3b |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Explain | Question number | A3b | Adapted from | N/A |
Question
Three isomers of \({{\text{C}}_{\text{3}}}{{\text{H}}_{\text{6}}}{{\text{O}}_{\text{2}}}\) are ethyl methanoate, methyl ethanoate and propanoic acid.
Explain which of the three compounds has an infrared spectrum with a broad absorption between 2500–3300 cm–1 and an absorption at 1730 cm–1.
Markscheme
propanoic acid;
only one with OH which accounts for (broad) absorption between 2500–3300 cm–1
region / OWTTE;
Examiners report
Many students could use the spectroscopic data provided to correctly identify the compounds, with the first part of the question, dealing with mass spectrometer data, probably proving the most challenging.
Syllabus sections
Core » Topic 11: Measurement and data processing » 11.3 Spectroscopic identification of organic compounds
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