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NMR

AQA A Level Chemistry

QuestionAnswer
Complete the following statement - All nuclei with the same chemical environment have the same __________ ___________ Chemical Shift
How many peaks (not including splitting) are found in the 1H NMR spectrum of butanoic acid? 4
How many peaks (not including splitting) are found in the 1H NMR spectrum of ethyl ethanoate? 3
How many peaks (not including splitting) are found in the 1H NMR spectrum of methyl propanoate? 3
How many peaks (not including splitting) are found in the 1H NMR spectrum of propyl methanoate? 4
How many peaks are found in the 13C NMR spectrum of butanoic acid? 4
How many peaks are found in the 13C NMR spectrum of ethyl ethanoate? 4
How many peaks are found in the 13C NMR spectrum of methyl propanoate? 4
How many peaks are found in the 13C NMR spectrum of propyl methanoate? 4
In 1H NMR Spectroscopy what does the integration data tell us? Relative number of equivalent H atoms in the molecule
In 1H NMR Spectroscopy what does the splittin pattern tell us? The number of adjacent, non-equivalent protons according to the n + 1 rule
In NMR Spectroscopy what does the number of peaks relate to? The number of different environments
In NMR Spectroscopy what the chemical shift tell us? The molecular environment
What is the n + 1 rule? It gives the number of peaks into which the signal of the neighbouring environment will be split
What is TMS? Tetramethylsilane. Its used as the standard for NMR Spectroscopy and its peak is set to zero on the chemical shift scale
Why are the advantages of TMS? Volatile, inert, it has signals that are well to the right of the majority of the peaks in organic chemistry and it has one environment
Why is deuterated trichloromethane used as the solvent in 1H NMR spectroscopy (instead of undeuterated trichloromethane)? Deuterium is not NMR active and therefore doesn’t show up on the spectrum - it is still used in 13C but the peak can removed by the computer software
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