Organic Chemistry A Short Course
Quiz 12 :
Spectroscopy and Structure Determination
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Q43 Q43 Q43
An unknown oxygen containing organic molecule shows a parent peak in its mass spectrum at m/z 58.There is no measurable uv or visible spectrum.The IR shows strong, sharp absorptions at 2930 cm-1 and 1725 cm-1.The 1H NMR shows a singlet at 2.1 (6H).Which of the following structures best fits the spectral data?
Q44 Q44 Q44
An unknown hydrocarbon shows a parent peak on its mass spectra at m/z 86.There is no evidence of absorptions from visible or uv spectra.The IR shows no major absorptions outside the C-H stretch and bending vibrations.The 1H NMR reveals a singlet at 0.9 (9H), a triplet at 0.98 (3H), and a quartet at 1.6 (2H).
Q45 Q45 Q45
An unknown oxygen-containing organic molecule shows a parent peak on its mass spectra at m/z 122.With no information from the visible or uv, the IR revealed major broad absorptions from 2500 cm-1 to 3500 cm-1, and strong sharp absorptions at 2930 cm-1, 1690 cm-1, and 1230 cm-1.The 1H NMR revealed a singlet downfield around 13 (1H) and a multiplet at 7.2 (5H).The molecule consistent with these facts is: