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- (a) Compound A has molecular formula C5H10O. It shows three signals in the 1H-NMR spectrum - a doublet of integral 6 at 1.1 ppm, a singlet of integral 3 at 2.14 ppm, and a quintet of integral 1 at 2.58 ppm. Suggest a structure for A and explain your reasoning. (b) Compound B has molecular formula C8H6O2. The IR, 1H-NMR, and 13C-NMR spectra are shown below, they are also downloadable for closer inspection by clicking the link under the spectral data. Suggest a structure for B and explain your reasoning. (c) Compound C has molecular formula C5H8O. The IR, mass, 1H-NMR, and 13C-NMR spectra are shown below, they are also downloadable for closer inspection by clicking the link under the spectral data. Suggest a structure for C and explain your reasoning.(a) Explain how pyrrole is isoelectronic with the cyclopentadienyl anion.(b) Specifically, what is the difference between the cyclopentadienyl anion and pyrrole?(c) Draw resonance forms to show the charge distribution on the pyrrole structure.Compound C has the molecular formula C5H8O. The IR, 1H, 13C, and DEPT NMR spectra of this compound are shown below. (a) Calculate the double bond equivalent of compound C and briefly explain what the values obtains represents. Interpret the IR spectrum. (b) Based on the information provided, determine the structure of compound D.
- (a) Based on the information provided, determine the structures of compounds. (b) Assign all peaks in 1 H and 13C NMR spectra of compoundsDescribe the characteristic infrared absorption frequencies that would allow you to distinguish between the following pairs of compounds. (a) cyclohex-2-enone and cyclohex-3-enone (b) cyclohexanol and cyclohexanone2 (a) In the following reaction, PCC A (i) Draw the structure of compound A. (ii) Explain using the IR spectra to confirm that the reaction is completed. (iii) Identify the molecular ion peak for compound A. (iv) Fragmentation of A shows a peak at m/z 111. Draw the possible cation for this peak. (v) Determine the resonance structure of this cation.
- Describe the characteristic infrared absorption frequencies that would allow you to distinguish between the following pairs of compounds. (a) pentanal and pentan-2-one (b) butanamide and pentan-3-one(a) Compound A has molecular formula C9H18O but shows only one singlet in the 1H-NMR spectrum. Suggest a structure for A and explain your reasoning. (b) Compound B has molecular formula C10H14. The IR, mass, 1H-NMR, and 13C-NMR speca are shown below, they are also downloadable for closer inspection by clicking the link under the spectral data. Suggest a structure for B and explain your reasoning.2. DEDUCE THE STRUCTURE FOR EACH COMPOUND WITH THE INDICATED MOLECULAR FORMULA AND THE 1H-NMR AND IR SPECTRA PROVIDED. (a) Formula: C4H8O2
- (a) Base on the information provided, determine the structures of compounds. (b) Assign all peaks in 1 H and 13C NMR spectra of compounds(b) Distinguish each as aromatic or antiaromatic in terms of electronic basis. Explain which one is more stable. (i) Compound A Compound B (ii) Compound C Compound D (iii) Compound E Compound FCompound A has molecular formula C5H8Br4 but shows only one singlet in the 1H-NMR spectrum. Suggest a structure for A and explain your reasoning.