mass spectroscopy and infrared spectra.* *Note: Simulations may be used.

Determine which functional group is present in a compound whose infrared spectrum shows a strong, broad absorption between 2500 cm⁻¹ and 3300 cm⁻¹ and a sharp absorption at 1710 cm⁻¹.

A sample of pure ethanol, $\text{C}_{2}\text{H}_{5}\text{OH}$, is analysed by mass spectrometry. Which peak in the mass spectrum represents the molecular ion, $\text{M}^{+}$, formed by the loss of one electron from a neutral ethanol molecule?

A student analyses an unknown organic compound using mass spectrometry. The mass spectrum shows a molecular ion peak at $m/z = 88$ and a base peak at $m/z = 43$. Which of the following fragments is most likely responsible for the base peak?