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- The two compounds 1,2-dibromobenzene and 1 3-dibromobenzene both have the molecular formula C6H4Brz. a)Draw the chemical structures of the two molecules. b)Can these two molecules be distinguished by 1H NMR spectroscopy? Give reasons for your answer and describe the number of proton environments and their splitting for both molecules. Can these two molecules be distinguished by 13C NMR spectroscopy? Give reasons for your answer. Can these two molecules be distinguished by IR spectroscopy? Give reasons for your answer and describe the main IR signals (with frequencies) you expect to see for both molecules. Can these two molecules be distinguished by mass spectrometry? Give reasons for your answer.interpret/identify the peaks and their characteristics. (ex. C=O, 4H, doublet) compound name: isopentyl acetate (C7H14O2)What are the major peaks (above 1600 cm-1 ) you would expect to see? Give approximate wavelength and functional assignment (i.e. C—H , C==O , etc.)
- what are the significant peaks of C4H9Br at 2970 cm-1 1209 cm-13. 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.What is the meaning of each? 2- Extrinsic Absorption
- c) The mass spectrum of 2,3-dibromopentane (CH; CHBr CHBr CH₂ CH3) includes the following peaks. Mass number (m/z) Relative abundance 15 29 107 109 199 201 203 i. What is the mass number of molecular ion, [CH; CHBr CHBr CH₂ CH₂]? Show your working. ii. Identify the molecular formula (including isotopic composition where relevant) of the 6 peaks. a b d 22 e f Mass number (m/z) 15 29 107 109 199 100 39 44 45 0.3 0.6 0.3 201 203 Molecule formula [CH₂]What functional group and molecule can you get from its IR spectrum? Support your answer by identifying prominent peaks (wavenumbers cm^-1) and assigning the functional group.The M+ peak is at 136. What does is mean to have the [M+2] peak at 138? What is the chemical formula and the structure for the M+ peak? What are the structures for the peaks at 57, 43, and 29 m/z?
- What would be the multiplicity associated with peak 2?Absorption bands in the region of 1600-1700 cm-1 are often used for quantification of caffeine. What does the bands in this region refer to?The mass spectrum of n-octane shows a prominent molecular ion peak (m>z 114). There is also a large peak at m>z 57,but it is not the base peak. The mass spectrum of 3,4-dimethylhexane shows a smaller molecular ion, and the peak atmass 57 is the base peak. Explain these trends in abundance of the molecular ions and the ions at mass 57, and predict theintensities of the peaks at masses 57 and 114 in the spectrum of 2,2,3,3-tetramethylbutane.