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relative intensities of the six individual lines:
  • 1 : 2 : 1 : 1 : 2 : 1 (compare with the figure)
In this case the intensities of the individual lines don't follow the same pattern as the binominal factors. This only holds true for multiplets caused by spin-spin coupling with a single set of equivalent protons!

Now try to predict the number of individual lines and their relative intensities in the resonance signal of the proton A (d = 6.35 ppm) in:
structure JAM = 16.4 Hz
JAX = 10.3 Hz

Check on page 100 for the correct solution!