1. Butane

2. C 6 H 14 : Could be hexane, 2-methylpentane, 3-methylpentane, dimethylbutane – BUT is too complex for hexane, too many high MW fragments for dimethyl butane, and 43 is too small for 2-methyl pentane

3. Ethanol: Note increased size of m/z = 45 due to resonance stabilisation by O lone pair

4. 1-Butanol 2-methyl-2-propanol Two major fragmentation routes: a) dehydration and b) β elimination. Dehydration gives m/z = 56, but is not observed in 2-methyl-2-propanol C 4 H 10 O

5. C 5 H 12 N a) b)

6. C 4 H 8 O a) b)

8. Chloromethane CH 3 Cl; m/z 52, 50 (M + ), 37, 35 (M-CH 3 ) +, 15 (M-Cl) +. 2-Bromopropane CH 3 CHBrCH 3 – difficult to establish isomers m/z 124,122 (M + ), 81, 79 (Br) +, 43 (M-Br) +.

9. Dichloromethane CH 2 Cl 2 m/z 88, 86, 84 (M + ), 37, 35 (Cl) +, 51, 49 (M-Cl) +. Ethylbenzene : C 6 H 5 CH 2 CH 3 77 65