Question: Draw the structural formula from the spectroscopic data given below. In each case show how the fragmentation analysis. (ii) Mass Spectrum (m/z) 158 (M+); 103

Draw the structural formula from the spectroscopic data given below. In each case show how the fragmentation analysis.

(ii) Mass Spectrum (m/z) 158 (M+); 103 (M-55); 83 (M-73); 57 (M-101) IR (cm-1) 2935, 2981, 1718; 1023, 1149 1H NMR (ppm) 3.3 (s) ; 2.3 (s); 1.5 (s) 13C NMR (ppm) 201.2; 166.3; 81.9; 51.5; 30.0; 27.9

(iii) Mass Spectrum (m/z) 241 (M+); 142 (M-99) IR (cm-1) 3277; 2854, 2929; 1100 1H NMR (ppm) 2.57 (t) ; 2.17 (s); 1.45 (m); 1.21-1.32 (m); 0.87 (t) 13C NMR (ppm) 50.1; 30.1, 31.8; 27.4, 29.5,29.8; 22.6; 14.0

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