Exam 1 Practice KEY

Just need help with 7 & 8

Match each spectrum with its structure: Which spectrum is for ethyl methyl ketone and which spectrum is for methyl 3-bromopropionate? (ignore the triplet at 77 ppm) CH3-C-CH₂CH3 ethyl methyl ketone. 200 zde CH₂0-C-CH₂CH₂Br methyl 3-bromopropionate Spectrum A 100 Spectrum B

CH3 2. An unknown isomer of C4H9Cl has the ¹³C NMR and DEPT-135 spectra shown below: 13C NMR: 90 70 |||| A 50 8 (ppm) CH3CH₂CH₂ CH₂ CI 30 10 DEPT-135: CH3 CH3-CHCH₂-CI B 90 70 Circle the compound that is represented by these spectra. Clearly explain your reasoning. you will need to explain how each of the other three isomers was eliminated from consideration. 50 8 (ppm) CH3CH₂ CH-CI CH3 C 30 10 CH3 CH3-C-CI CH3 D

Q6. Complete Table 6. i) Copy and paste (insert) the correct alternative of the structures below into the table, ii) insert expected number of different ¹H and 1³C environments expected for these compounds (Table 6: columns 2 and 3 respectively) and correctly label the ¹H and ¹³C NMR spectra below in boxes provided .CI CI Table 6: Assigning NMR spectra for aromatic Structures of disubstituted No. of expected ¹H NMR peak/s benzene compounds 1,2-dichorobenzene 1,3-dichorobenzene .CI 1,4-dichorobenzene CI compounds No. of expected ¹³℃ NMR peak/s

Please answer fast i give you upvote.

Which of the following C5H8 compounds best fits the spectrum. The integration values are shown above the individual resonances. 1.00 C3H3 3.00 1.99 1.98 4.5 4 3.5 2.5 1.5 0'5 A) CH;CH,CH,-CEC-H B) CH;CH,-CEC-H CH3 D) A O O O

Need a help a little with HNMR question please! Thank you Part 3B Set 1. Can 1H NMR spectroscopy be used to differentiate between the two compounds? Briefly explain why or why not. Predict the 1H NMR spectrum for each compound (include integration, multiplicity, and approximate chemical shift). Either draw the actual spectrum or put in a data table format.

A L K F OCH2CH,CH(CI)CH3 E OH *C, H and "I" have been intentionally not used as labels to avoid being confused with carbon, hydrogen and iodine a) For 1H NMR, what multiplicities would you expect for the hydrogens labeled a, d, f and g? b) Which of the hydrogens is most upfield? Why? (besides its position on the NMR chart) c) How many C resonances do you expect for this molecule? DO EITHER D OR E d) Explain how you would determine the molecular ion peak in the mass spectrum? e) Briefly discuss three major bands you would see in the Infra red. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).

Hi I know that the red is the correct one and it's like the nmr but Chan you explain why. Also in the nmr can you tell me which peak it's important and if it's double triple or single bond with the ratio and compoundstructure.thank you very much .

not use ai please

Draw the structure for a compound with the formula C8H10O3 that exihibits the 1H-NMR spectrum provided integral parts are also provided in a table above the 1H-NMR picture.

Infrared Spectrum T (the left one) represents which of the following compounds? Notice the labels i and is on the two spectra close to the y-axis (transmittance) FIGURE 1 0 cyclohexanone 3000 INFRARED SPECTRUM phenylacetylene 2000 -COOH benzoic acid 1000 08 ii mm 02 3000 -OH phenol INFRARED SPECTRUM 2000 1000

6) a)Assign the peaks in the 'H NMR shown below to the correct protons in molecule shown below. The portion of the NMR between 8-6.5 ppm has been magnified for easier viewing. (Hint: Draw resonance structures to distinguish the benzene and alkene Hs. 1H 2H 1H الس 2H CHH BH. CH3 A CH3 D H3C N H CH3 H 6H 6H PPM b) Draw a resonance that shows how you can differentiate the alkene hydrogens in the NMR. It is ok to have more than one positive and negative charge for the resonance structures with a NO2 group.) H H3C-N CH3 CH3 CH3

Biochemistry HW question 21 need help

The IR spectra for acetaminophen and phenacetin are shown below. a. Identify which spectrum is for acetaminophen and which is for phenacetin. b. Label the key bond/functional group signals on each spectrum. (e.g. N-H, C=O, O-H, C=C, C(sp3-H, C(sp³)–H) OH fou acetaminophen phenacetin 100.0 90 80 70 60 50 40 30 20 10 0.0 40000 3000 2000 1500 1000 4000 čm-1 LOD 4000 3000 2000 1500 1000 500 3305.35- 6891 1228.63- 117185 107.83-

CHM 2410Z - Organic Chemistry I Lab 1) Consider the following molecules and choose the two represented by the spectra below. Use the IR spectra to narrow the possibilities, and then use the NMR data to confirm your choice. a. 1H NMR data: 85.8 ppm (1H, pentet) 85.0 ppm (1H, triplet) 8 4.9 ppm (1H, triplet) 83.6 ppm (2H, triplet) 8 2.2 ppm (2H, quartet) 82.1 ppm (1H, singlet) 8 1.7 ppm (2H, pentet) b. 1H NMR data: 8 2.4 ppm (2H, triplet) 82.1 ppm (3H, singlet) 8 1.6 ppm (2H, sextet) 8 0.9 ppm (3H, triplet) IR/NMR Postlab i IR spectrum: IR spectrum: Relative Transmittance 0.8 0.6 0.4 0.2 0.8 0.6 0.4 0.2 3000 3000 OH H 2000 H 2000 Wavenumber (cm-1) Wavenumber (cm-1) H 1000 1000 OH