Basics of NMR

Exercise 3

Let’s consider 2 isomers I and II in mixture. Based on the 1H NMR spectrum of the mixture recorded at 250 MHz:

Comparison of the spectra of isomers 1 and 2
1) Which NMR signals are specific to isomer II for the mixture?
2) What are the proportions of isomers I and II in the mixture?
Correction
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