3. What type of oxygen-containing compound shows no significant IR absorption at 1630-1780 cm' or at 3200-3550 cml? A. an alcohol B. a carboxylic acid C. an ether D. a ketone
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- An oxygen-containing compound shows an absorption band at 1700 cm', and no absorption at 3300 cm', 2700 cm', or 1100 cm1. Which class of compounds is suggested in the given information? A. Carboxylic Acid B. Ester C. Ketone D. Aldehyde E. AlcoholIn IR absorption spectra of a compound, strong absorptions at 3300 cm and 2100 to 2260 cm were observed. What functional group might the compound contain? a. Alkyne b. Alkene с. Alcohol d. Carboxylic acidWhy 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.
- How can IR spectroscopy be used to distinguish between the following compounds?a. a ketone and an aldehydeb. a cyclic ketone and an open-chain ketonec. benzene and cyclohexened. cis-2-hexene and trans-2-hexenee. cyclohexene and cyclohexanef. a primary amine and a tertiary aminewhat compound has this given IR Spectra? 80 2725 2827 40 2976 1731 of 4000 2000 Wavenumbers (cm-1) O A. butanol B. butanoic acid O C. butanone O D. butyraldehyde %TransmittanceIN an IR spectrum there is a very strong peak at 1700 wavenumber and a broad peak at 3300, this indicates the possible presence of O a. An alcohol group Ob. COOH group O C. a keto group Od. An aldehyde group
- 3. A molecule absorbs IR at a wavenumber of 1720 cm-1. Which functional group could account for this absorption. I. aldehydes II. esters III. ethers O 1& II 1 & III II ONLY III ONLY3. One student's sample of benzil had a melting range of 90-95°C. The IR spectrum showed a strong, broad absorption at 3200-3400 cm, The student is unsure whether the absorption is from water or from residual ethanol. What absorption-or lack of an absorption-in the IR spectrum could show that the absorption is probably due to moisture? What absorption(s) would suggest that ethanol? b. a. The student wanted to obtain another IR spectrum, but the lab period was over. The instructor told the student to store his product in an open beaker, not a capped vial. Why would this be helpful?The way a molecule fragments in a mass spectrometer depends upon OA. all of the them B. the stability of the fragments C. the structure of the molecule O D. OE. the energy of the electron beam hitting the molecule the bond strengths
- For each of the five molecules shown below, tell whether it will be expected to show ultraviolet absorptions in the 200 to 400 nm range or not. Explain your answer for each. CH3 b. C. Indole OH Aspirin d.a) The UV-vis spectrum of an unknown drug shows a primary absorption peak at 300 nm and secondary peak at 280 nm. Sketch the UV-vis and fluorescence spectrum that are consistent with the observations. Spektrum UV-vis ubat yang tidak diketahui menunjukkan puncak penyerapan primer pada 300 nm dan puncak sekunder pada 280 nm. Lakarkan spektrum UV-vis dan pendarfluor yang konsisten dengan pemerhatian. b) Draw a Jablonski Diagram that illustrates the formation of absorption and subsequent emission of fluorescence. Lukiskan rajah Jablonski yang menggambarkan pembentukan penyerapan dan pancaran pendarfluor yang seterusnya.11. Predict the number of signals expected in the 13C spectrum of a. 1-bromo-2-chlorobenzene b. 1-bromo-4-chlorobenzene