CAIE A Level Chemistry 9701 · Analytical techniques
2-methylpropan-2-ol, , is a simple alcohol. Describe the expected proton NMR spectrum of this compound, including the chemical shift region and splitting pattern for each type of proton. Describe the use of tetramethylsilane (TMS) as a standard for chemical shift measurements. State why deuterated solvents, such as , are used when obtaining a proton NMR spectrum. Describe how the presence of the OH proton can be confirmed by proton exchange using .
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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