2 3. Match the following structures with the listed feature IR signals. (Write the letter of the structure by the IR signal): 1) 1680 2) 1745 3) 3300-3400 4) 3300-2500, 1710 HO -CH B D OH For the remainder of the test, solve the structures for the following. If you get a structure perfect, you will get full credit. If you do not get a structure perfect, you may still get some partial credit. Thus, it is in your interest to show some of you work, make a structure, or tell me what you know for sure. 4. C6H1202 IR: 1745 H NMR: 0.88 (3H, triplet, J = 7.1 Hz), 1.39 (2H, sextet, J = 7.1 Hz), 1.74 (2H, pentet, J = 7.1 Hz), 2.04 (3H, singlet), 4.15 (2H, triplet, J = 7.1 Hz)