Non-NMR Spectroscopies Solutions: #4

4.* (1997 2 6) Infrared spectroscopy. What follows is the infrared spectrum of the compound C₈H₁₂. Assign those features you can in this spectrum and from these assignments suggest the structure of the C₈H₁₂ compound. Explain your reasoning.

The peak around 2850-2860 cm^-1 is probably an alkane C-H stretch. The peak at 2200 cm^-1 is probably an alkyne C-C stretch. The peak at 3300 cm^-1 is probably an alkyne C-H stretch. Based on these data and the molecular formula, we can deduce that the compound is