SL & HL Answers to questions on 1H NMR spectroscopy (1)
1. The solvent will be present in a high concentration and the peak due to the hydrogen
atom in the trichloromethane solvent will mask the peaks from the sample.
2.
Compound
Number of peaks
Ratio of areas
(a) methane
1
1
(b) ethane
1
1
(c) propane
2
3:1
(d) ethanoic acid
2
3:1
(e) propanoic acid
3
3:2:1
3. Yes, you can use 1H NMR to distinguish between all four isomers (see below).
Compound
Number of peaks
Ratio of areas
1-bromobutane
4
3:2:2:2
2-bromobutane
4
3:2:1:3
1-bromo-2-methylpropane
3
6:2:1
2-bromo-2-methylpropane
1
1
4. Butanal, CH3CH2CH2CHO.
5. The strong external magnetic field of the MRI machine will interfere with the electrics of
the pacemaker.
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
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