(a) Identity five different absorption values in the infrared spectrum that could be used to differentiate the two structures shown. (b) How many signals would be observed in the ^1H NMR spectrum for each molecule? (a) Propose a valid structure of a molecule consistent with the IR and mass spectra shown below, (b) name the structure, and (c) identify the fragments responsible for the base peak and draw a mechanism to show how they would form.