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Answers:

In this isomer the protons H1 and H3, as well as H3 and H4 are equivalent,
that is, the spectrum will consist of two resonance signals.

Did you get the wrong answer? Check again on page 13.
Try again with the following excercise:
How many signals do you expect to find in the spectrum of the following substance?

A)

structural formula

B)

structural formula
Check page 37 for the correct answer!