In a 400 MHz 1H NMR spectrometer, a proton resonates at 1560 Hz higher than that of tetramethylsilane. The chemical shift value of this proton is ______ ppm. (approx value) (Chemical shift of tetramethylsiane is fixed at zero ppm)
1
3.5
2
4
3
1.5
4
4.5
5
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