The 'H NMR signal for which of the indicated protons occurs furthest downfield? III CI H H-C=C-C-C-CH, IV I II

A compound with molecular formula C4H11N has the 'H NMR spectrum shown. Which choices shows the correct number of protons giving rise to each signal? I II III PPM O1- 6H, II - 3H, III - 2H O1- 5H, II - 4H, III - 2H O1- 6H, II - 4H, III - 1H O1- 1H, II - 4H, III – 6H

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Following are the 'H and 13C NMR spectra for each of three isomeric ketones with formula C7H14O. Determine a structure to each pair of spectra and assign each H and C. Carbon spectrum А C,H140 Carbon spectrum В C;H140 CDCI3 200 150 100 50 Proton spectrum CDC13 A C,H140 200 150 100 50 1.96 2.00 2.91 3.0 2.5 2.0 1.5 1.0 0.5 0.0 211.04 -44.79 –17.39 – 13.78 -218.40 - 38.85 –18.55

Which structure of molecular formula, C7H14O, fits the proton NMR spectrum shown below? doublet septet 11 10 8 5 4 3 2 HSP-00-203 ppm en -00

5) Which of the indicated protons in the following compound would appear farthest upfield in the 1H NMR spectrum? IV wy ||| F

Rank the indicated protons in order of increasing 1H NMR chemical shift.

Which of the indicated protons in the following compound would appear most upfield in the ¹H NMR spectrum? II O IV O O O O O II III IV I & III 1 III F

Which molecule corresponds to the following NMR spectrum? 3H singlet 3H 2H triplet quartet 4H multiplet PPM A: B: D: O A O D O B

Consider the NMR chemical shift of a methoxy proton (R-O-CH3) and the chemical shift of a R2- N-CH3 proton. Which of the following statements are correct? O Chemical shift of both are around 4, making them indistinguishable in most cases. The chemical shift of the methoxy proton will be higher. The R2-N-CH3 proton chemical shift will be higher. O The chemical shift of both are around 1, making the indistinguishable in most cases.