Chem 335 - Winter 1999 -
Organic Chemistry II (1 point each)
1. The parent molecular ion for methane would show up in a mass spectrum at m/z =
a) 12
b) 14
d) 18
e) some other value
2. The mass spectrum for HBr would show two approximately equal peaks at m/z =
a) 80 , 81
c) 81 , 82
d) 81 , 83
e) 82 , 84
3. A likely place for a fragmentation in 1-hexene is between
a) C1 - C2
b) C2 - C3
d) C4 - C5
e) C5 - C6
4. In the mass spectrum of pentane, the peak at m/z = 57 is due to
a) loss of H
c) loss of CH3CH2
d) loss of CH2=CH2
e) loss of H2O
5. The best resonance form for the ( M - CH3 ) peak from t-butyl alcohol has the positive charge on
a) a 1° carbon
b) a 2° carbon
c) a 3° carbon
d) H