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17

Great! Your answer is right!

One signal is due to the protons bound to carbon 2 and 5, the second is due to the protons bound to carbons 3 and 4.
It is the number of groups of equivalent protons that determins the number of signals in a 1H NMR spectrum.

Here is another opportunity for you to practice the identification of equivalent protons:

Which protons in these substances are equivalent to each other?
How many signals do you expect in the 1H NMR spectra of these substances?

A)

 2D 3D

B)

 2D 3D

C)

 2D 3D

Check your answers here!