9. In the following pairs of compounds, describe whether there should be an increase in the wavelength of maximum absorption and whether there should be an increase in absorption intensity in going from the first compound to the second: (a) 00-89
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- Which molecule below has the following IR absorptions: 3400 cm-¹ (broad), 2948 cm- 1 ¹ (weak), 1768 cm-¹ (strong)? A B C D E OCH 3 OH B NH₂ D H EA compound of formula C20H29NO absorbs 4 molar equivalents of hydrogen. How many rings does it contain?1 The IR spectra A-D are given as follows: Spectrum A waveruter Spectrum B Spectrum C Spectrum D wavenumber an si (i) From the selection of compounds below, choose the suitable compound that matches the given spectrum (A-D). OH NH2 NH2 OH HO (ii) Explain your answer in (i) by showing the important absorption bands in the appropriate region.
- 30. A compound (C7H₁40) has a strong IR absorption at 1715cm¹. The ¹HNMR spectrum has two signals at d 1.10 (doublet) and d 2.77 (multiplet), ratio 6:1. The 13CNMR spectrum shows three lines at d 218, 39, and 18. Which one of the following structures best fits with this spectroscopic data? Not.e: d means delta C B A D О С CHOTreatment of 2-methylpropanenitrile [(CH3)2CHCN] withCH3CH2CH2MgBr, followed by aqueous acid, affords compound V, whichhas molecular formula C7H14O. V has a strong absorption in its IRspectrum at 1713 cm−1, and gives the following 1H NMR data: 0.91(triplet, 3 H), 1.09 (doublet, 6 H), 1.6 (multiplet, 2 H), 2.43 (triplet, 2 H), and2.60 (septet, 1 H) ppm. What is the structure of V?When the 1î-NMR spectrum of acetone, CH3COCH3, is recorded on an instrument operating at 200 MHz, a single sharp resonance at 2.1î is seen. (a) How many hertz downfield from TMS does the acetone resonance correspond to? (b) If the 1î-NMR spectrum of acetone were recorded at 500 MHz, what would the position of the absorption be in î units? (c) How many hertz downfield from TMS does this 500 MHz resonance correspond to?
- 8). For the following molecule: I I II Which double bond indicated should give the STRONGEST absorption signal? 9). Which one of the following compounds will have the lowest wavenumber for carbonyl absorption? II III III NH2 IV VMolecular Formula: C7H10O IR: Only notable main absorptions is at 1710, 2945, and 3100 cm-¹ ¹H spectrum 1H, s 13C spectrum 200 180 160 140 3H, s 2H, t J = 7.1 Hz 2H, d J = 7.1 Hz dr 2H, t J = 7.1 Hz PPM 120 PPM 100 80 60 0 I T 40 20Identify the significant absorption peaks by labeling them right on the spectrumand includethe spectrum in your laboratory report. Absorption peaks corresponding to the followinggroups should be identified: C—H (SP3) C—H (SP2) C—H (aldehyde) O—H C=O C=C (aromatic)aromatic substitution pattern C—OC—X (if applicable)
- Describe the number of signals and their splitting in the ¹H NMR spectrum of (CH3)2CHOCH3. 4 signals: 2 doublets, a singlet, and a septet 3 signals: 2 doublets and a septet 3 signals: a doublet, a quartet, and a septet 2 signals: a doublet and a septet 3 signals: a singlet, a doublet, and a septetDescribe the number of signals and their splitting in the 1H NMR spectrum of (CH3)2CHOCH3. A) 3 signals: 2 doublets and a septet B) 2 signals: a doublet and a septet C) 3 signals: a doublet, a quartet, and a septet D) 4 signals: 2 doublets, a singlet, and a septet E) 3 signals: a singlet, a doublet, and a septetWhat is the structure from the formula C10H12O and the spectra?