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Answers:

molecule idealized line spectrum
RCH2-CH3 Spectrum 1
RCH2-CH2R' Spectrum 2
RCH2-CHR2' Spectrum 3
RCH2-CR3' Spectrum 4

Any mistakes? Then check here for some hints and explanations!

A measurement for the intensity of the coupling between two groups A and X of equivalent protons is the coupling constant JAX:
JAX = Seperation of two neighboring lines in a multiplet, determined in Hertz

As an example, the following detail of a 1H NMR spectrum shows the doublet of the methyl protons in the molecule (CH3)3CH-O-CH(CH3)2 around d = 1.05 ppm (Transmitter frequency n0 = 60 MHz):

What is the value for the coupling constant JCH3,CH?

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