Question 31 What is the m/z value of the molecular ion below? CI CI CI H ---
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The molecule is a benzene ring with three chlorine atoms and an aldehyde group. The formula is $C_7H_3Cl_3O$. Show more…
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Madhur L.
Which of the molecules gives rise to a molecular ion with an odd value of m/z? A. NC8H13 B. N2C7H10 C. Cl2C6H12 D. Br2C8H14
3.1 In chemical ionization (CI) mass spectrometry analyses, using methane as reagent gas, compounds are ionised via ion-molecule reactions. For the following compounds, draw the structures of the resulting pseudo molecular ions that are expected to form in the CI source. 3.2 Draw the structures of the molecular fragments, commonly found in organic compounds, that may give rise to: a. the ions, found at the following m/z values in electron ionisation mass spectra: (i) m/z 29 (ii) m/z 43 b. the following neutral losses from the molecular ion of a molecule: (i) 15 Da (ii) 18 Da 3.3 Propose three different types of fragmentation/rearrangement mechanisms for the following compound, formed in an electron ionisation mass spectrometer's source. Clearly indicate on the fragments whether they are free radicals, carbocations or radical cations.
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