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- b) Can these two molecules shown below be distinguished by mass spectrometry? Give reasons for your answer.Question 1.3 How can UV-vis spectroscopy be used to qualitatively identify a compound? (a) Measure the decrease in absorbance over time. (b) Make a calibration curve. (c) Measure the absorbance of a solvent blank. (d) Match the absorbance spectrum of the sample to published data. (e) Compare the UV-vis spectrum of a compound with its NMR spectrum.Mass spectrometry is often used to both identify and quantify compounds. What is different between mass spectra with changing concentrations of a compound? How would you design a method (i.e. what would you need) to both identify and quantify a compound using mass spectrometry?
- Shown below are the IR spectrum and the Mass Spectrum of a compound of molecular formula C3H8O. Using the spectral data, determine the structure of the compound. Provide evidence from both spectra to support your answer.Which of the following compounds gives this mass spectrum and explain why it is so?The molecular weight of compound D is calculated to be 359.22 g/mol., However, the mass spectrum contains two peakS, with m/z 358.02 and m/z @360.02, in a approximately a 1:1 ratio. Explain this observation. HTML Editorg
- What is the mass spectrometry of this compound ?3. Both methylcycloheptane and ethylcyclohexane have the same molecular mass. Explain how is it possible to distinguish between the two compounds by studying and comparing both their mass spectra.Explain how the following pairs of isomeric compounds could be differentiated by mass spectrometry. i) Br Br and ii) -CH(CH,)2 CH,CH,CH3 and
- 4. Halogenated compounds are particularly easy to identify by their mass spectra because chlorine and bromine occur naturally as mixtures of two abundant isotopes. Chlorine occurs as "CI (75.8%) and "CI (24.2%). Ignore the presence of "C isotopes. For the compound, C,H,Cl;: a) At what masses do the molecular ions occur? b)What are the percentages of cach molecular ion?1 (c) 2-Methyl-3-pentanol reacts with PCC to form compound F. (i) Draw the structure of F. (ii) In the mass spectrum, identify the m/z value of the molecular ion peak for compound F. (ii) Fragmentation of radical cation F exhibits two fragment ion peaks at m/z 57 and m/z 71. Propose the structures of these two fragments. (iv) Draw the resonance structure for each of the cation in (iii).. A compound made of C, H, and Cl shows two peaks on a mass spectrum, one at 52 u and the other at 50 u. What is a reasonable molecular formula for this compound? Assume that there are only 1H, 12C, 35Cl and37Cl in the compound