There are several isomers with the molecular formula C6H14N2 - AQA - A-Level Chemistry - Question 11 - 2018 - Paper 2
Question 11
There are several isomers with the molecular formula C6H14N2.
One isomer is shown.
H3C—CH2—N—CH2—CH2—NH2
Give the number of peaks in the 13C NMR spectrum of this ... show full transcript
Worked Solution & Example Answer:There are several isomers with the molecular formula C6H14N2 - AQA - A-Level Chemistry - Question 11 - 2018 - Paper 2
Step 1
Number of 13C peaks
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Answer
There are 4 peaks in the 13C NMR spectrum of this isomer. Each carbon in the structure contributes to the overall count.
Step 2
Splitting pattern
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Answer
The splitting pattern for the hydrogens labelled α is a triplet.
Step 3
Explanation
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Answer
This is due to the presence of two hydrogens on the adjacent carbon atom. According to the n+1 rule in NMR spectroscopy, where n is the number of neighboring hydrogens, the peak for the α hydrogens will split into n+1 peaks, resulting in a triplet (2+1=3).
