Question

In how many ways –CH3 protons can couple with the protons on adjacent carbon atom relative to the external field.

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question in unit test.

Asked question is from Nuclear Magnetic Resonance in section Absorption Spectroscopy of Engineering Chemistry I

Answer 1

Right answer is (d) 4

Best explanation: In four ways –CH3 protons can couple with the protons on adjacent carbon atom relative to the external field.