The skeletal formulas of two organic compounds, (i) and (ii), are shown below.
Which of the following methods would successfully distinguish between samples of these two compounds?
Measuring the exact m/zm/zm/z ratio of the molecular ion peak using high-resolution mass spectrometry
Treating each sample with sodium hydrogencarbonate solution and observing the presence of effervescence
Comparing the fingerprint regions of their infrared spectra
Looking for the presence of a strong C=OC=OC=O absorption peak above 1700 cm−11700\text{ cm}^{-1}1700 cm−1 in their infrared spectra