An AX system gave 4 lines at 4.72, 4.6, 1.12 and 1.0 ppm away from the TMS using an nmr spectrometer operating at 100 MHz . What are the values of $\mathrm{J}_{\mathrm{AX}}($ in Hz$)$ and $\delta_{\mathrm{Hz}}($ in ppm $)$, respectively
(a)12 and 3.6
(b)6 and 3.6
(c)12 and 2.86
(d)6 and 2.86
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Each doublet is split by 0.12 ppm × 100 MHz = 12 Hz; the two doublet centres are at 4.66 and 1.06 ppm, 3.6 ppm apart.