5. In the previous problem, we saw that 'H NMR data includes chemical shift, multiplicity, and integration for each peak. There's one more piece of information: the coupling constant (J-value). There is no coupling constant for a singlet peak (because there is no coupling!). All other peaks will have a coupling constant. This is reported in Hertz (Hz), and it is found by measuring the distances between the lines of the peak. Typical J-values are found in the bottom right corner of the chemical shift chart (posted on Brightspace). The most common J-value is 7 Hz. This is the value observed between neighboring protons when all of the bonds are freely-rotating. When there is restricted rotation (due to pi bonds or rings), the J-value can be larger or smaller than 7 Hz. Consider the following 'H NMR spectrum. The integral values are shown near the peaks. 2H elle 0 2 3 PPM The data from this spectrum is written out like this: 2.45 (q, J = 7 Hz, 2 H); 2.12 (s, 3H); 1.06 (t, J = 7 Hz, 3 H) Notice that the distances between the lines in the quartet and the triplet appear to be the same, because they are the same. Both peaks have a coupling constant of 7 Hz. Based on the integrations, this molecule probably has one methylene group (2 H) and two different methyl groups (3 H each). Draw a reasonable structure that is consistent with this spectrum. The formula is C4H20