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- 13. The molecular formula of the compound responsible for the below spectrum is C9H20. What is its structural formula? 3 N PPM 2H 3H IHD= 2(9)+2-20 2How many signals will be present in the ¹H NMR spectrum of the molecule below? Do not consider split signals as seperate signals. 0000 6 HC H3C о- CH3 CH3 CH3 CH3Consider the multiplicity of the ¹H NMR peak shown below. Identify how many hydrogens are on the neighboring carbon(s). alle 1 4 7 +/- 2 5 8 Hydrogens 3 6 9 0 X C x 100
- A compound with molecular formula C6H11N has the following ¹H NMR spectrum. Which of the following is the correct number of protons giving rise to signal II? II 12.0 H 5 6 7 8 O2H O 16 H 08H O4H O 1H O 11 H 4 PPM MacBook Air 2.0 H III 8.0 H 0 start NowRefer to the NMR spectrum below. How many total H's are there in this compound? 2H 3H 2H 11 10 8 5 4 3. 2 1 ppm HSP-02-073The 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-
- 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 DWhich of the following compound is consistent with the following 13CNMR spectrum? To preview the image click here 80 до A ОН 70 60 ОН B 50 40 PPM 30 Хон 20 10 ОН D о2. How many signals expected for the following compounds? O CH3CH₂CH₂ CH3 CH3 CH3CH₂CHCH₂CH3 Cl . CH3CHCH₂CHCH3 I CH3 CH3 CH3CH Br -OCHCH3 CH3
- 14 The following is the predicted ¹H-NMR spectrum for an unknown compound with molecular formula C6H₁4O. This compound is a liquid at room temperature, is slightly soluble in water, and reacts with sodium metal with the evolution of a gas. astered 1H 3 4 2H CH3 cl CH3CH₂CHCHCH3 a bl d OH f A Submit Answer Choose from the constitutional isomers below to assign a structure to this spectrum. Hint: this signal is a pair of overlapping 2H multiplets 1H PPM B b CH₂CH3 Retry Entire Group 5 a CH3CH₂CHCH₂OH a b c d e 3H 1 3H f CH3 CH3CH₂CH₂CHCH₂OH a b c d eg (Choose the letter corresponding to the correct structure from the drop-down list provided.) Correct Structure: A C Assign signal number 5 (indicated as a red number on the spectrum above) to the corresponding hydrogen(s) (shown as a red lower-case letter on the structure above). If relevant, consider the possibility of diastereotopic hydrogens with slightly different chemical shifts. 9 more group attempts remaining (Write the letter(s) of…How many signals do you expect to be observed from a DEPT-90 spectrum of the compound below? 4 1 6. 7From the 13C spectrum of a compound, one can assign signals to specific carbon atoms of the compound and determine the number of protons on each of those carbon atoms. Such information in conjunction with the DEPT C-13 chart will allow the appearance of the corresponding DEPT spectrum of the compound to be predicted. There are five signals (I – V) in the 13C spectrum of compound A as shown below. At the exactly same location of each of these five signals, "a peak", "no peak", or "an inverted peak" may appear in the corresponding DEPT-135 spectrum. Predict the DEPT-135 spectrum of compound A by selecting the expected signal appearance at each of these five locations in the DEPT-135 spectrum. - II II IV V in HO A 100 PPM 180 160 140 120 80 60 40 20 v At the location of signal I A. no peak v At the location of signal IIl В. а рeak v At the location of signal IIl C. an inverted peak v At the location of signal IV v A the location of signal V
