Question

2. Match the electron impact (El) mass spectrum with the correct structure from the choices below. of the fragments in the El spectra of the following molecules (write the correct letter in the upper left-hand corner of the spectra). Draw the structure of the indicated fragments (*) С В OH H *(43) *(71) *(43) 100 HS--1 100- -N-113 во- 80- 60- 60- 40- 40- 20- 20- m/z m/z 3. Predict the molecular ion peak pattern (El spectrum low resolution) for the following species (show the line pattern with relative abundances, masses, and [M]/[M+2]*, etc. designations) ii. C4HBBr2 iii. CIBr CsH11C iv. C2HeSO4 i. Relative Intensity Relative Intensity

Answer 1

Answer 2)

(A) Possible Fragmentation Pattern ОН • + ཚེoA OH OH 1e OH CH- H2G མ་མ་ལག དབང་པར་ཁང་། - c ། «CH -2- H2G། • H2Gc H2G; H Hoc CH3 Ħ H CH, CH3 --CH3 CH3 C5H 100 Molar Mass = 86 M* = m/e= 86 M-15 m/e=71 Spectra 1 can be assigned H2CH3 * H20 H | CH CH3 m/e = 43 • + CH3 H3G C. 1e 1e H36 + H3C— C or H,cམལH H3C1 CH3 CH3 CH3 C5H100 Only stable enough hence Only possible M* = m/e = 86 Molar Mass = 86 fragments.

H2 n2 1e H2 or H3CCH2 SC.CH3 Hc-cc-Co CH2 H H3CC CH3 -2e - H2 C5H100 m/e = 43 mle = 43 Stabilization M* = m/e = 86 Molar Mass = 86 + H2 H3c.co m/e? 71 stabilization." Mass Spectra 1 : Assigned structure (C) as it can give both 71 and 43 signals with ennough possibility

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