The correct match for the protons labeled in compound \(\mathrm{X}\) in Column M with the corresponding chemical shifts (\(\delta\), ppm) in Column N is
| Column M | | Column N | |
|---|
| P | \(H_a\) | I | 7.00 (ddd, \(J\) = 8.4, 7.3, 1.4 Hz, 1H) |
| Q | \(H_b\) | II | 7.17 (dd, \(J\) = 8.4, 1.4 Hz, 1H) |
| R | \(H_c\) | III | 7.59 (ddd, \(J\) = 8.4, 7.3, 1.4 Hz, 1H) |
| S | \(H_d\) | IV | 8.12 (dd, \(J\) = 8.4, 1.4 Hz, 1H) |