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The isomer B) has the following three groups of equivalent protons with chemical shifts that are in agreement with the ones given in the problem:
Molecule equivalent protons d [ppm]
Isomer B >C(CH3)2 0.6 ... 1.9
>CH- 1.4 ... 2.1
-CHO 9.1 ... 10.0
After learning in this section that the chemical shift of a proton can be predicted to some extend, we will turn in the next section to another important characteristic of the signals in a spectrum:
their intensity.