14

Solution:

Protons are equivalent if they are involved in similar bonds, that is, if the geometry of the remainder of the molecule is identical with regard to the protons, or, in other words, if the character of the neighboring chemical bonds is identical.

Now try to classify the various pairs of protons of thiophene
proton pair
  equivalent  
non-equivalent
 
2-3
2-4
2-5
3-4
3-5
4-5
 
 
Thiophen

Now check your answers!

start
back
end
end
Copyright
german
spain