Choose the molecule that is most likely to produce a spectrum with these IR frequencies: v = 2979, 2869, 1126 cm B) 1-butene C) diethyl ether D) butanoic acid E) 2-butanone
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- Following is the mass spectrum of 3-methyl-2-butanol. The molecular ion m/z 88 does not appear in this spectrum. Propose structural formulas for the cations of m/z 45, 43, and 41.QUESTION #1 PROPOSE ANSWER FOR THE FOLLOWING SPECTRA ? AND JUSTIFY YOUR ANSWER 1- % abundance 100 60 50 40 30 20 10 مسلسل m/z ratio 1558he number of signals expected to be observed for CD2Cl2 solvent in CNMR is (I for D is 1) a) 1 b) 2 c) 3 Q2: Which of the following isotopes do not have quadrupole momet b) 27AI (I = 5/2) d) 5 e) 7 a) "Li (I = 3/2) %3D c) 170 (I = 5/2) d) 19F (I= 1/2) 23: Which of the following isotopes is expected to be NMR inactive? 12C b) 170 c) 31p d) 1°F e) 29Si : Consider the compound Fe3(CO)12, calculate %C (Fe 55.85 g/mol, C 12.1 gme c) 29.7 % e) 34.2 d) 28.6 % 30.7 % b) 6.13 %
- How many ‘H-MNR signals are there?Choose the molecule that is most likely to produce a spectrum with these IR frequencies: v = 2979, 2869, 1126 cm-1 A) butane B) 1-butene C) diethyl ether D) butanoic acid E) 2-butanoneIsoamyl acetate is the primary component of artificial banana flavor. Which signals will be in the positive phase, negative phase, or nonexistent in normal 13C NMR, DEPT-90, and DEPT-135 of isoamyl acetate?
- Below is the 13C compound with molecular formula C12H16O. Measured in CDCl3 Assign the carbons by putting the appropriate letter over each peak in the spectrumQuestion 7 of 21 Choose the frequency of a peak that is most likely to correspond to an N-H stretch in an IR spectrum. A) 3450 cm-1 C) 2950 cm-1 D) 2250 cm-1 E) 1750 cm-1d) The ¹HNMR spectrum OF 4-hydroxybenzaldehyde is shown below, with the spectroscopic details summarized in the table that follows. Use this data to answer questions i) to iii). Chemical Shift (ppm) 10 9.92 9.71 7.79 6.89 8 Splitting/Multiplicity singlet singlet (broad) doublet doublet PPM i) The signal at 9.71 ppm is produced by the proton(s) at location Blank 1 ii) The signal at 7.79ppm is produced by the proton(s) at location Blank 2 iii) The signal at 6.89ppm is produced by the proton(s) at location Blank 3 OH Integration B 2 1H 1H 2H 2H O ⠀ HD
- 9 What compound has a formula of C5H120 * ?and a peak at 3300 cm-1 (ähäi 1) Ether Alcohol Aldehyde KetoneQ10) Describe spectrophotometry tests? If you were given a solution that contains an absorbing molecule how would you determine its max absorbance?Choose the molecule that is most likely to produce a spectrum with these IR frequencies: v = 3084, 2970, 2939, 1651, 887 cm-¹ A) butane B) butanal C) 1-butyne D) 1-butanol E) 2-methylbutene