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Molecule coupling A/X multiplets A/X JAX in Hz
A) C(CH3)2/CH doublet/heptet 5.5 ... 7
B) CH2/CH3 quartet/triplet 6.5 ... 7.5

If you had problems with deciding which proton groups show spin-spin coupling, you might want to check page 90 for some additional explanations

If you recall the examples so far where spin-spin coupling occured between groups of protons, then you should have no difficulties in answering the following question:

Under what conditions would you expect to see no coupling between two given groups of protons in a molecule?

Compare your answer to ours on page 89!