11 An unknown compound has a molecular formula of C6H₁₁N. Its IR spectrum shows a signal at 2250 cm Draw the structure of this unknown compound. 220 200 180 160 140 120 100 80 60 40 20 ppm 2 H I 9 H 12 11 10 9 8 7 6 5 4 3 2 1 -1 Its 1H NMR and 13 C NMR spectra are shown below.

For each NMR, label any and all triplets, singlets, etc. Propose a structure that matches each NMR spectrum.

Tunc 201 Identify the isomer of C3H5Br that has the 13C NMR spectrum shown. Select the single best answer. 220 200 180 160 140 120 100 O Z-1-bromopropene O 2-bromopropene O 3-bromopropene O E-1-bromopropene O bromocyclopropane ppm X 80 S 60 40 CH₂ CH 20 0

Predict the ¹H NMR chemical shift of the circled proton(s) in the structure below. H₂N H₂ C CH 3 A) 1-5 ppm B) 4.0-5.5 ppm C) 6.0-8.0 ppm D) 8-10 ppm E) 12-14 ppm

3. Determine the structure for C6H₁1Br, based on the proton NMR spectrum shown. Two peaks: each is a 1H, s, that overlap 10 2H, d 1H, m 3H, s N 3H, d 0

Predict which proton will have the most upfield signal in the ¹ H NMR spectrum. O H Predict which proton will have the most upfield signal in the ¹H NMR spectrum. H H 11 H Br O H V CH3 H IV A) I B) II C) III D) IV E) V

4. How many absorptions will the following compound have in its 1H-NMR spectrum?

E 2.2 لها 3.10 1H-NMR spectrum for an unknown with the molecular formula C5H10O is given below. Assign the peaks and provide a structure of a compound that is consistent with the given spectrum. 2.0 1.4 1.2 1.0 0.8 2.10 3.25

'Η NMR 6 H 2H 2H 1 H PPM "C NMR 20 PPM Each data set is specific to an individual compound. Use the analytical data provided to come up with a structure consistent with that data.

A compound with molecular formula C5H10O2has the following NMR spectrum.   Determine the number of protons giving rise to the signals at 2.0 ppm and 4.0 ppm.