Give the structures of F and G and provide a mechanism that accounts for their formation. Assign the IR signals to bonds in the molecules. همه LiAlH4 F G F Vmax 3340, 2973, 1646 cm-1 GVmax 3345, 1604 cm−1
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- Deduce the structure of the compound whose formula is C2H;NS from the IR spectrum below. 100 90 80 70 60 50 4000 3000 2000 1000 Wavenumbers (em") -1157 -1361 -1442 2866-2920 2970 %TransmittanceDiscuss the transient absorption spectra of 2-aminophenothiazine in nitrogen saturated solution.Carbon monoxide [CO] exhibits an IR absorption at 2143cm-1, acetone [CH3C(O)CH3],exhibits an IR absorption for the CO vibration at 1715 cm-1 and ethanol [CH3CH2OH] exhibits an IR absorption for CO at ~1150 cm-1. Draw Lewis structures of these three molecules and use your structures to explain the observed differences in the CO IR absorption peak frequency (nCO).
- 13C-13C coupling is generally not observed. Explain why this is, and explain how one could obtain a molecule in which 13C-13C coupling is observed.The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound containing no nitrogen exhibits strong, broad absorption across the 2500-3300 cm-1 region, accompanied by 2200 (w) and 1715 (s) cm-1bands.Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak. What functional class(es) does the compound belong to? List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm-1. The functional class(es) of this compound is(are)fill in the blank 1.(Enter letters from the table below, in any order, with no spaces or commas.) a. alkane (List only if no other functional class applies.) b. alkene h. amine c. terminal alkyne i. aldehyde or ketone d. internal alkyne j. carboxylic acid e. arene k. ester f. alcohol l. nitrile g. etherThe base peak in the mass spectrum of 2,2,5,5-tetramethylhexane (molecular mass = 142) is at m/z = 57, which corresponds to a composition of C4H9. Suggest a structure for the fragment that accounts for this peak and offer a reason for why this fragment is so abundant.
- Which of the following molecules best describes the IR spectrum given with a molecular formula of C6H12O2?Write notes on the most important absorptions and fragmentations found in the following spectra and use the information to suggest the best possible structure. (Molecular formula: C8H1602, M =144)...Acidified potassium dichromate(K2Cr2O7/H+) may be used to transform 3-methylpentanal into another compound via oxidation. How could you use IR Spectroscopy to distinguish between the reactant and the product?
- Which of the following would not theoretically be seen in the splitting patterns for the 1Hb NMR signals for the following molecule if Jab < Jbc . CH; „Hb H;aC `CH2c-Br A. type b splits type a into a doublet B. type b splits type c into a doublet O C. type a splits type b into a septet then type c splits those into triplets O D. type c splits type b into a triplet then type a splits those into septetsThe IR spectrum below belongs to an organic compound A having one nitrogen atom. Determine which structures that fits to the IR spectrum. Justify your answer by providing two (2) IR absorption peaks with their wavenumber. CN NH2 Ahsorbance / 4 50 100- 4000 3000 2500 2000 1500 1000 500 Wavenumbers / cm[References] The mass spectrum of octanoic acid, CH3(CH2)6COOH, exhibits a series of peaks differing by 14 amu at m/z 29, 43, 57, 71, 85, and 99. Draw the structure of the fragment resulting in the m/z 71 peak. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. • Do not use the square brackets tool in your answer. opy aste H,C earch 84%