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Answers:

molecule	no J-coupling	J-coupling
	due to equivalency within CH3, CH2 due to large separation
	due to equivalency within CH2, CH3 due to large separation CH3-CHBr-CO-CH2-CH3 CH3-CHBr-CO-CH2-CH3 CH3-CHBr-CO-CH2-CH3 CH3-CHBr-CO-CH2-CH3	CH3-CHBr-CO-CH2-CH3 CH3-CHBr-CO-CH2-CH3
Verbindung	No J-coupling	J-coupling