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- In the box provided, write the IR frequency or range of frequencies that would best distinguish between the two compounds shown. Specify which compound (A or B) will display a band at this frequency in its IR spectrum. Bond O-H (alcohol) O-H (carboxylic acid) N-H Stretching frequency (cm-¹) 3200-3650 2500-3300 3100-3550 2850-3000 3000-3100 C-H (alkane) C-H (alkene) C-H (alkyne) C=C 2100-2250 C=C 1600-1680 C=O (aldehyde/ketone) 1630-1820 C=O (ester) 1735-1800 1700-1725 C=O (carboxylic acid) C-O 1000-1250 A 3300 B OH Intensity Medium, broad Strong, broad Medium Medium Medium to strong Weak to medium Weak Weak to medium Strong Strong Strong Strong (Choose the most prominent frequency. Do not include units in your answer. Use only the frequencies listed above. If there is more than one correct answer, only give one.) Write the letter of the compound, followed by the range of frequencies, separated by a comma. Example. "A,1600-1850". IR frequency or range of frequencies: cm-1 Previous NextA chemist isolates an unknown organic compound with the molecular formula C5H11N and obtains an IR spectrum (shown below). Select the structure that most closely matches the available information on this compound. Note: In case the labeled tick marks on the x-axis are difficult to read they are (from left to right) 4000, 3000, 2000, 1500, 1000, and 500 cm1. LOD 4000 3000 2000 1500 1000 500 HAVENUMB ER I-|| The correct structure is `NH2 NH2 NH a b d -NH2 -NH2 NH e f h TRANSMITTANCEI%I2. Refer to the following spectrum. Deduce the structure of the compound (C6H100) by providing significant absorption frequencies of functional groups. Y www 4000 3000
- QUESTION 1 The IR spectrum below belongs to an organic compound A having one nitrogen atom. Determine which structures that fits to the IR spectrum. Justify your answer by providing two (2) IR absorption peaks with their wavenumber. CN `NH2 Ahserbance /% 50- 100- 2000 Wavenumberrs/ cm 4000 3000 2F00 1F00 1000 F00Chemistry Assign each absorption between 4000 and 1500 cm -- to the corresponding functional group in the product. ACETIC ACID, 3-METHYLBUTYL ESTER INFRARED SPECTRUM 0.8- 0.6 0.4 0.2 3000 2000 1000 Wavenumber (cm-1) INIST Chemistry WebBook (https://webbook.nist.gov/chemistry) Transmitance2) The IR spectrum below is of one of the compounds shown. Circle structure that corresponds to the spectrum and label the peaks you used to make your choice. Transmittance (%) OD D 4000 3000 my mm 2000 1500 Wavenumber (cm-¹) 1000 500
- With reference to the IR and NMR spectra given below, answer the following: (You may write your answers on the actual IR spectra.) % Transmittance 100 (a) 80 60 R 20 0+ 4000 маманит 3500 Wil 3000 Benzaldehyde mm 2500 Wavenumber (cm'¹) 2000 1500 1000 In the IR spectrum of benzaldehyde, which signal is due to the carbonyl bond? Type response here Which signal(s) indicate that the compound is an aldehyde, rather than a ketone? Type response hereWhat is the expected IR absorptions you would expect to see from the following molecule? OH If you were to take the IR of the starting molecule and then the product after the reaction is complete which IR absorption peaks will disappear and which will appear? Give absorption number and what part of the molecule that absorption references. H3O*Long-range coupling between protons more than two carbon atoms apart is sometimes observed when bonds intervene. An example is found in 1-methoxy-l-buten-3-yne. Not only does the acetylenic proton, Ηa, couple with the vinylic proton Hb, it also couples with the vinylic proton Hc, four carbon atoms away. The data are: Construct tree diagrams that account for the observed splitting patterns of Ηa, Hb, and Hc.
- The DEPT-90 spectrum exhibits 6 in the 0-50 ppm region The DEPT-135 spectrum exhibits x 100 ppm region that is a positive ▾ C6 signal(s) for the CH groups: ▼ 1,2,6 ✓ in the sp2 hybridized region 100-150 C3 and C4 ▼ signal(s) (only the quaternary carbon atoms, signal(s), indicating the presence of a methylene group (CH₂) attached to an oxygen atom, are missing); there is C5 ▼ C1 and C2 ▼ and signal(s) in the 50-ORGANIC CHEMISTRY PLEASE EXPLAIN, SEE PHOTO: A compound, with molecular formula C5H10Br2 displays the following 13C NMR along with the DEPT-90 and DEPT-135 13C NMR spectra. Identify the structure of this compound. Please annotate each of the spectra, explaining what each signal or absence of signal means and the information obtained from each.6) The compound with the molecular formula C4H10O was synthesized. It was further analyzed using IR spectroscopy. The spectrum of the compound is illustrated below. Identify the structure of a compound. Justify your answer. Identify as many peaks on its IR spectrum as possible. (5 points) 100 80 60 60 %T 40 20 20 0 4000 R2020-93124TM 3000 2000 1500 1000 400 Wavenumber [cm-1]