1. How many pi molecular orbitals (including bonding, nonbonding, and antibonding) are expected for 1,3,5-hexatriene?
a) 2
b) 4
c) 6
d) can't tell
e) none of the above
2. Assuming that both 1,2- and 1,4-addition take place, the addition of HBr to 1,3-cyclohexadiene would be expected to give two different products that are
a) enantiomers
b) diastereomers
c) cis-trans isomers
d) constitutional isomers
e) none of the above
3. The compound below that could NOT easily be made by a Diels-Alder reaction is
a) cyclohexene
b) 1,3-cyclohexadiene
c) 1,4-cyclohexadiene
4. A Claisen rearrangement typicallyforms
a) a phenol
b) a conjugated alkene
c) a diene
d) a ring
e) none of the above
5. In photodynamic therapy the therapeutic effect is caused by
a) light
b) cancer cells
c) singlet oxygen
d) free radicals