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6 Nov 2019
1-7?
The polling question at the end of the last class meeting was: Constitutional isomers with which of the following molecular formulas will exhibit distinct IR absorbances at > 1500 cm-1? (select all) The answer options were: C4H10, C4H8, C4H6, C3H60 Of these answer options, C4H10 was not a correct answer, as the unsaturation number is zero, and alkane C-H stretching vibrations all appear at just under 3000 cm-1, with no differences expected due to constitutional isomerism. NMR, in contrast to IR, is an excellent tool to discriminate the fine details of molecular constitution. Explore this statement by completing items 1-7 below. Draw all constitutional isomers of C4H10. Identify the number of peaks expected in the 1H NMR spectrum of each isomer. Identify the splitting expected for each peak in the 1H NMR spectrum of each isomer Predict the relative integration of each peak in the 1H NMR spectrum of each isomer. Predict the chemical shifts of each peak in the 1H NMR spectrum of each isomer. Sketch the 1H NMR spectrum of each isomer. Which differences are most distinctive between the 1H NMR spectra of these isomers? Show transcribed image text
1-7?
The polling question at the end of the last class meeting was: Constitutional isomers with which of the following molecular formulas will exhibit distinct IR absorbances at > 1500 cm-1? (select all) The answer options were: C4H10, C4H8, C4H6, C3H60 Of these answer options, C4H10 was not a correct answer, as the unsaturation number is zero, and alkane C-H stretching vibrations all appear at just under 3000 cm-1, with no differences expected due to constitutional isomerism. NMR, in contrast to IR, is an excellent tool to discriminate the fine details of molecular constitution. Explore this statement by completing items 1-7 below. Draw all constitutional isomers of C4H10. Identify the number of peaks expected in the 1H NMR spectrum of each isomer. Identify the splitting expected for each peak in the 1H NMR spectrum of each isomer Predict the relative integration of each peak in the 1H NMR spectrum of each isomer. Predict the chemical shifts of each peak in the 1H NMR spectrum of each isomer. Sketch the 1H NMR spectrum of each isomer. Which differences are most distinctive between the 1H NMR spectra of these isomers?
Show transcribed image text