The infrared spectrum of the compound with the mass spectrum shown below lacks any significant absorption above 3000 cm-1. There is a distinct peak near 1740 cm-1 and another strong peak near 1200 cm-1. molecular ion: M* = 102. Relative Abundance (%) 100 90 80 70 60 50 40 30 20 10 20 30 40 50 m/z 60 80 8 100

Identify the base peak, the molecular ion, and C13 isotope in the mass spectrum shown below

Consider the following mass spectrum, which exhibits a parent peak of 79 m/z, a "P+2" peak of 81 m/z, and a base peak of 43 m/z. In conclusions that may be drawn from this spectrum. 100 80 60 40 20 10 20 30 40 m/z 50 60 70 80 The compound has two isomers. True O False Relative Intensity

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B. MASS SPECTRUM Identify the following from the low resolution mass spectrum of the unknown compound: 100 Relative intensity LT. 80 80 60 40 20 Base peak 0 20 Molecular lon peak 40 Mass Spectrum of Compound P 121 152 60 C. DOUBLE BOND EQUIVALENTS Calculate the DBE of the unknown compound. m/z This information indicates, for example, the presence of 100 Mass spectrum of the compound. 120 140 160 a + x

Which compound would produce the mass spectrum?

Propose a molecular formula for a compound that has the following mass spectra. Show your working. m/z intensity 170.0 39.2 171.0.3.1 172.0 38.1 173.0 2.9 100 Relative Intensity 88 8 40 20 MS-NU-0353 25 mint 50 75 100 m/z 125 150 175

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A researcher is studying cytochrome oxidase, a protein that uses iron to bind diatomic oxygen. She collects two IR spectra, shown below. In the first spectrum, no isotopic labeling is used (top). In the second, 10 has been replaced with 180 (bottom). 820 655 790 0.5- 714 695 733 820 655 755 0.5- 714 695 733 0+ 600 650 700 750 800 850 Vo (cm") Based on the above ratio, which is the most likely source of this vibration, (a) the Fe-O stretch in Fel-O=0, or (b) the O-O stretch in Fel"-O=O? You can assume that the atomic weight of Fe is 56. ww n wwm % Transmission

Intrpt as many of the main peaks in the following spectra as you can No handwriting ok