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31

B)

 formel 1

Each of the groups containing protons - including the two methyl groups - is exposed to a different environment.
formel 2  und  formel 3
so that each signals occurs at a different frequency. Obviously the protons of each methyl and methylene groups will only give rise to a single, shared signal. (see page 21 and page 25).
Therefore we will observe a total of 4 signals.
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