Based on the mass spectrum shown below, 100 73 HO 80 A 58 20 100 10 20 30 40 50 100 60 70 m/z 80 90 110 (i) identify the molecular ion peak of compound A. (ii) explain how the labelled fragments are formed. Relative Intensity
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- Following is the mass spectrum of an unknown compound. The two highest peaks are at m/z 120 and 122. Suggest a structure for this compound. (Data from http://webbook.nist.gov/chemistry/.)The 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.Propose mechanisms for the formation of ion fragments m/z 97, 83, 69 and 55 in the mass spectrum of (CH3)2CCHC(O)C(CH3)2CHCH2 and explain in detail why this compound cannot undergo McLafferty rearrangement.
- The mass spectrum of 2,2-dimethylpropane shows only a very weak molecular ion peak at m/z = 72. However, a large peak at m/z = 57 is seen. Suggest a possible structure of the fragment giving rise to this large peak and suggest a reason as to why this peak is so large.a) Predict the proton spectrum chemical shift, coupling and integration of the following molecule? vanillin C8H8O3 b) Also predict its cross-peaks in COSY and 1H-13C HETCOR?Following is the mass spectrum of 1-bromobutane. Q.) Account for the appearance of the M + 2 peak of approximately 95% of the intensity of the molecular ion peak.
- An organic compound having a halogen gives its mass spectrum peaks at m/z 138, 136, 123, 121, 57. The peaks at 138 and 136 are equiaxed and correspond to the molecular ion. The peaks at 123 and 121 are coeval. Identify the type of halogen and how peaks 123, 121, 57 result12. The mass spectrum of 2,2-dimethylpropane shows only a very weak molecular ion peak at m/z = 72. However, a large peak at m/z = 57 is seen. Suggest a possible structure of the fragment giving rise to this large peak and suggest a reason as to why this peak is so large. type answerIdentify the key fragment structures of 4'-Bromoacetophenone based on the peaks of its attached mass spectrum.
- 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)...Which structure would show major fragment ion at 59 and 73 m/z in its mass spectrum?The mass spectrum of compound E with the molecular formula C8H7ClO is shown below. Draw the most likely ion fragment for the signals at m/z 111 and 139. Why do these signals at m/z 113, 141, and 156 appear as pairs with similar intensities at m/z 111, 139, and 154?