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Problem: The coupling constant (J) for bromoethane is 7 Hz when the  1H NMR spectrum is acquired at 250 MHz. What is the coupling constant between these protons when the spectrum is acquired at 500 MHz?  a) 14 Hz b) 7 Hz c) 3.5 Hz d) 21 Hz e) none of these

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The coupling constant (J) for bromoethane is 7 Hz when the  1H NMR spectrum is acquired at 250 MHz. What is the coupling constant between these protons when the spectrum is acquired at 500 MHz? 

a) 14 Hz

b) 7 Hz

c) 3.5 Hz

d) 21 Hz

e) none of these

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