After combustion analysis and mass spectrometry, the molecular formula of an unknown compound was determined to be C15H1402. The first two suggested structures are shown as A and B and the IR spectrum obtained, Fig. 2, can be used to distinguish between A and B. Explain, with reasoning, which of the two structures is the correct one. aio IR Spectrum (thin film) 4000 A 3000 2000 1698 v (cm¹) Fig. 2 B 1600 008 1200 00S 800 008

A compound with a molecular formula of C5 H100 results in the following IR spectrum. What functional groups are most likely? Select all correct answers. Infrared Spectrum 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 3500 3000 2500 2000 1500 1000 Wavenumbers (cm-1) alcohol alkene ketone ether Transmitance

Question 12

Elemental analysis determined unknown Compound G to contain 40.0 % carbon, 6.7 % hydrogen. Compound G had an M+ = 60 m/z on its MS. Its IR displayed three absorbances: strong at 1710, strong below 3000, and broad from 2500 to 3500. The proton NMR showed an absorbance at 1.7 ppm (lowest whole number ratio of H =3), and an absorbance at 11.5 ppm (lowest whole number ratio of H = 1). Compound G was able to turn blue litmus paper red, and neutralize a base. What is Compound G? O CH3CO2H O Formaldehyde O HO C CH2 HO O CHy(OH)CHO O CHOHHCH(OH)

Use the 1H NMR and IR spectra given below to identify the structure ofcompound B (molecular formula C4H8O2).

Analysis of a sweet-smelling, neutral compound of carbon, hydrogen and oxygen produced the following results: %C = 54.5; %H = 9.1. From its mass spectrum, the molecular ion had a mass/charge ratio of 88. Its infra-red spectrum showed a prominent peak at 1735 cm–1. Figure below shows the NMR spectrum of the compound. Suggest a structural Formula for this compound.

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

The structural analysis of compound Z provides spectroscopic data as shown below. By systematic analysis, determine the structure of the compound!

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

The proton NMR and IR spectra of an unknown compounds is shown on the next page. Using the molecular formula C5H12O, find L a) the index of saturation b) the structure of the unknown compound c) assign the absorption bands to the functional groups in the IR spectrum d) label all peaks in the NMR spectrum, and label the same peak on the hydrogens in the structure Transmittance (%) 100 80 60 40 20 0 3500 CT TYCE Tabdf62 2874.30 2500 Wavenumber (cm-¹) 3000 2000 1466.09 1500 1307.78 1124.04 21 seser 908.46 1000 37.21