1) Draw C4H8Br2 that has the following 1H NMR spectrum: 1.97 (s, 3H), 3.89 (s, 1H). Hint: Draw C4H10 (there are two isomers), and then replace two H atoms with Br atoms.
2) A compound with molecular formula C5H10O2 has the following 1H NMR spectrum: 1.15 (t, 3H), 1.25 (t, 3H), 2.33 (q, 2H), 4.13 (q, 2H). Draw its structure. Hint: How many rings and ? bonds does C5H10O2 have?