CAIE A Level Chemistry 9701 · Analytical techniques
A chemist uses NMR spectroscopy to analyse two organic compounds, ethanol () and methoxymethane (). Compare the NMR spectra of these two compounds. In your answer you should discuss the number of signals, chemical shifts, splitting patterns, relative peak areas, the use of , and the role of tetramethylsilane (TMS) and deuterated solvents in the NMR experiment.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.