11 mark
The IUPAC name of mellitene, C6(CH3)6, is 1,2,3,4,5,6-hexamethylbenzene.
What splitting pattern will be seen on the 1H NMR spectrum for mellitene?
Singlet
Doublet
Triplet
Quartet
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Nuclear Magnetic Resonance Spectroscopy (AQA A Level Chemistry)
Exam Questions
3 hours30 questions21 mark
N-phenylethanamide, shown below, was used as a painkiller until the discovery of paracetamol.
How many 13C peaks are in the spectrum of N-phenylethanamide?
5
6
7
8
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31 mark
Which of the following chemicals has a singlet peak in its 1H NMR spectrum?
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41 mark
The structure of 2-chloropropane is shown below.
Which description of the peaks in the 1H NMR spectrum of 2-chloropropane is correct?
1 peak with a relative intensity of 6
2 peaks with relative intensities of 3 : 4
3 peaks with relative intensities of 3 : 1 : 3
2 peaks with relative intensities 6 : 1
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51 mark
How many peaks will be shown in the low resolution 1H NMR spectrum of propanal?
2
3
4
6
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11 mark
How many peaks are there in the 13C NMR spectrum of 1,3-dimethylbenzene?
3
4
5
8
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21 mark
Which one of the following has the fewest peaks in its 1H NMR spectrum?
Pentan-3-one
2-bromobutane
N-ethylethanamide
Ethyl ethanoate
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31 mark
How many peaks does benzopyran have in its 13C NMR spectrum?
5
6
8
9
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41 mark
Which one of the following has a doublet peak in its 1H NMR spectrum?
Pentan-3-one
2-bromobutane
N-ethylethanamide
Ethyl ethanoate
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51 mark
Which row correctly describes the splitting pattern observed on the 1H NMR spectrum for each labelled hydrogen?
A | One doublet and four triplets |
B | One triplet, one quartet and one singlet |
C | One triplet, one doublet and three singlets |
D | One triplet, one quartet and three singlets |
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11 mark
How many signals would be found in the 1H NMR spectrum of pentan-3-ol and what would be the ratio of the peak areas?
| Signals | Ratio of peak areas |
A | 4 | 6 : 4 : 1 : 1 |
B | 6 | 3 : 3 : 2 : 2 : 1 : 1 |
C | 4 | 3 : 2 : 1 : 1 |
D | 4 | 5 : 5 : 1 : 1 |
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21 mark
Which compound could the following 1H NMR spectrum belong to?
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31 mark
Penguinone is a cyclic ketone with a cute resemblance to a penguin:
Which row shows the correct number of peaks, peak area ratios and splitting patterns in the 1H NMR spectrum of penguinone? (s= singlet, t= triplet, q= quartet, m= multiplet)
| Peaks | Peak Area Ratios | Splitting patterns |
A | 4 | 3 : 3 : 3 : 3 | t, t, q, q |
B | 2 | 6 : 6 | s, s |
C | 3 | 3 : 6 : 3 | m, q, m |
D | 3 | 3 : 3 : 1 | s, s, s |
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41 mark
Which molecule gives the same number of peaks in its 1H and 13C NMR spectrum?
| propanal | pentan-3-one | 1,2-dimethylbenzene |
A | ✓ | ✓ | ✓ |
B | ✓ | ✓ | x |
C | x | ✓ | ✓ |
D | ✓ | x | x |
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51 mark
The monomer used to make perspex is methyl methacrylate.
The 13C NMR spectrum of methyl methacrylate is show below
What is the correct identity of the carbon labelled in peak 3? (You need to use a table of 13C chemical shift values to answer this question).
-C-CH3
-COOCH3
-O-CH3
=C-CH3
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