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) willdisplay a band at this frequency in its IR spectrum.BondO-H (alcohol)O-H (carboxylic acid)N-HStretching frequency (cm-¹)3200-36502500-33003100-35502850-30003000-3100C-H (alkane)C-H (alkene)C-H (alkyne)C=C2100-2250C=C1600-1680C=O (aldehyde/ketone) 1630-1820C=O (ester)1735-18001700-1725C=O (carboxylic acid)C-O1000-1250A3300BOHIntensityMedium, broadStrong, broadMediumMediumMedium to strongWeak to mediumWeakWeak to mediumStrongStrongStrongStrong(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 giveone.)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-1PreviousNext

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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 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 2850-3000 3000-3100 3300 B LOH 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 Next

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 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 2850-3000 3000-3100 3300 B LOH 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 Next

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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2. For the reaction performed in this experiment, the IR spectra for the reactants and product are shown below. For the IR spectra of acetone and the product, identify the important IR signals for each spectrum. Specifically: - for the IR spectrum of acetone, identify the signal which indicates the presence of the C=O bond and the signal which represents the CH bond (indicate the hybridization of the carbon). -for the IR spectrum of the product indicate which signal represents the CH bond (hybridization?) and which signal represents the O-H bond. You may write the answers on the spectra if you wish. Reactant: 1-bromobutane % Trasm ittaice 100 % Transmittance 20 GO 40 20 0 4000 Reactant: acetone 100 DO GO 40 20 3600 4000 3500 3000 IAN 3000 2500 M wavenumber (cm) 2500 2000 n 2000 Wavenumber (cm³¹) 1500 VI 1500 1000 1000
Why do aldehydes, esters, and amides all have a strong absorption in the 1630-1780 cm1 region of their IR spectra? A) The bond between H and the sp³-hybridized C in these functional groups vibrates in this energy range. B) Each of these functional groups has at least two resonance structures, and the different vibrations of the resonance structures give off energy in this region. C) The bond between O and the sp²-hybridized C in these functional groups vibrates at a frequency in this energy range. D) Light at this wavenumber causes the average C to O bond length to increase which causes more of this light to be transmitted. E) An electron in the bond of these functional groups gets excited to the * orbital.
The C=C bond in 2-cyclohexenone (shown below) produces an unusually strong signal. Explain using resonance structures. 14.06a1 Which of the following explains why the C=Cond in 2-cyclohexenone produces an unusually strong signal. O Conjugation with the C=O results in resonance, giving the C=C bond some single bond character (making it weaker). Conjugation with the C=O results in resonance, making the C=C bond more polar than usual. O Conjugation with the C=O results in resonance, making the C=C bond less polar than usual. O Conjugation with the C=O results in resonance, giving the C=C bond some single bond character (making it stronger).
Examine the IR spectrum in Photo 1. Record the wavenumber for each relevant peak in Data Table 1. Record the bond represented by each relevant peak in Data Table 1. Identify the functional groups associated with each bond and record it in Data Table 1. Circle the structure(s) on Photo 2 that match the data recorded in Data Table 1.
Determine the following for the compound C6H15N a.) degrees of unsaturation b.) Assign the principal IR absorption bands above 1500 c.) draw the structure of the compound d.) label the protons on your structure with letters and assign them to peaks on the NMR spectrum.
Based on the spectra provided, draw the structure. Label each unique carbon and hydrogen with the letters A, B, C… for use in assigning NMR peaks. fill in the data table assigning peaks in each spectrum. You should assign: • All 1H NMR peaks • Significant IR peaks above 1600 cm Example of what the table should include (imagine the structure of ethanol is drawn with the CH3 hydrogens labeled as A, the CH2 hydrogens labeled as B, and the OH hydrogen labeled as C) : hydrogen proton chemical shift integration splitting pattern couples to.. A 1.2 3 triplet B B 3.7 2 quartet A C 2.6 1 singlet -
There are four isomers shown below (compounds A-D). TWO of these isomeric nitrogen- containing compounds were extracted and isolated from tobacco leaves. Their structures were determined using 1H NMR. These two 1H NMR spectra are shown below. Make peak assignments of the NON-AROMATIC signals to determine which TWO isomers are represented. Use the specific labels (a-h) provided with spectra.
B (Choose the most prominent frequency. Do not include units in your answer. Use only the frequencies listed below. Write the letter of the compound, followed by the range of frequencies, separated by a comma. Example. "A,1600-1850". If there is more than one correct answer, only give one.) Bond Stretching frequency (cm²) Intensity O-H (alcohol) 3200-3650 Medium, broad O-H (carboxylic acid) 2500-3300 Strong, broad N-H 3100-3550 Medium C-H (alkane) 2850-3000 Medium C-H (alkene) 3000-3100 Medium to strong C-H (alkyne) 3300 Weak to medium C=C 2100-2250 Weak C=C 1600-1680 Weak to medium C=O (aldehyde/ketone) 1630-1820 Strong C=O (ester) 1735-1800 Strong C=O (carboxylic acid) 1700-1725 Strong
17) The partial chemical structure and ¹H NMR spectrum of 2-propanol (C3H80) are in the hydrogen atoms and label them with a subscript that corresponds to the labeled peaks in the ¹H NMR spectrum. Provide a brief rationale for your structural assignments. 11 10 7 9 8 7 6 Peak 1: 4.01 ppm 1H Septet 5 T 4 Peak 2: 2.16 ppm 1H Singlet 3 Peak 3: 1.20 ppm 6H Doublet HSP-03-214 ppm Rationale for peak assignments in structure: 2 1 0 Draw in labeled hydrogen atoms (H₁, H₂, H3) and assign them to peaks 1-3 C L-is Struct 14 2 H √3 C H² of 2-propanol H 287 11.1
2. Determine the structure of a molecule (C7H14N2) using the following spectral data. If you need more space, attach another piece of paper. IR: 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 4500 4000 3500 3000 2500 2000 1500 1000 Wavenumbers (cm-1) 'H NMR: 8 1.06 ppm (3H, doublet), 1.11 ppm (3H, triplet), 1.72 ppm (2H, quartet), 2.39 ppm (2H, triplet) 2.59 ppm (2H, quartet), 2.63 ppm (1H, sextet), 3.32 (1H, broad singlet) Transmitance
Match each of the following labeled molecules with the IR spectrum (Multiple answers might be possible for each spectrum, write the letter of all that apply). corresponding Molecule 1. Molecule 4 Molecule 7 OH OH e e H Molecule 2 Molecule 5 Molecule 8 Molecule 3 Molecule 6 Molecule 9
Fill in the following by identifying the peaks you labeled in your spectrum. Assign the peaks to the functional group vibrations listed. More than one peak (label) may appear for a vibration of a functional group .Functional Group Vibration Aromatic C-H stretching vibration Ketone C O stretching vibration cop bending vibration on monosubstituted aromatic ring (phenyl)..