Spectroscopy Problems That Combine Mass Spectrometry and Infrared Spectroscopy B.30 A chiral compound Y has a strong absorption at 2970 to 2840 cm¹ in its IR spectrum and gives the following mass spectrum. Propose a structure for Y. 100 Mass spectrum of Y Relative abundance 50 m/z = 136, 138 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

the mass spectrum, IR and 13 C and 1 HNMR spectra for an unknown organic molecule. Determine the structure ofthe molecule.

Relative Intensity 100 CH3 (CH₂)3CH3 LI 40 80 40 20 0++ MS-IW-3004 10 15 20 25 30 35 Using this MS, what is the molecular weight of this compound O 71 O 73 45 50 55 m/z O 72 O There is not enough information 60 65 70 75

Determine structure. Ignore the 77 ppm in the Carbon 13 NMR. Atomic Mass of structure is 87 g

Using the mass spectrum below propose a structure

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Determine the compound (name or structure) from the data. Explain features from each data.  Molecular formula: C6H5Br Use molecular formula to determine IHD IR: Identify the presence/absence of five key functional groups NMR: Analyze this last. Consider multiplicity and peak area to confirm compound. The 5 H peak area covers both peaks (at 7.1 and 7.5 ppm Structure?