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- Why does peak-splitting occur in NMR spectrum?Why is NMR the most powerful tool in organic chemistry and how is it better than IR spectroscopy?2. Describe some of the vibrational mode at stretching and bending associated with Infrared Spectroscopy. Draw representative structure denoting such vibrational modes.
- What are 2 most unique aspect of NMR, UV spectroscopy , IR spectroscopy, and Mass SpectroscopyHow to determine equatorial vs axial in NMR3. Identify C-Cl stretching peaks in CDC13 and CHC13 spectra. Do these peaks have exactly the same frequencies for both compounds? Explain your answer. 4. Is the C==O stretching frequency the same for acetone and deuterated acetone? Explain your answer. 5. Identify C==O overtone in acetone spectrum which corresponds to the transition from ground level, n=0, to the second excited level, n=2.
- 1. Answer BOTH parts a) and b). a) i) Explain the difference between spin-lattice relaxation (T₁) and spin-spin relaxation (T2). ii) Deuterated acetone, (CD3)2CO, is a common solvent for NMR spectroscopy. Sketch the 1³C{¹H} NMR spectrum of this solvent. Label and explain any coupling in your spectrum. iii) Predict the structure of the residual protio-solvent species observed in the ¹H NMR spectrum of (CD3)2CO. b) OH A B C max 260 nm 295 nm i) Suggest electronic transitions that can be attributed to the absorptions reported for compounds A and B, respectively. ii) With the aid of diagrams explain why B absorbs at a lower energy to A. iii) Explain why compound C possesses a charge transfer transition. iv) For compound C explain why changing solvent polarity influences the wavelength of the charge transfer absorption. -CEZ4. Why does a carbon to oxygen double bond absorption band have a greater intensity than a carbon to carbon double bond absorption band?2. Do you observe any change in the form of the absorbance bands while moving from nonpolar to polar solvents?