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864 Chapter 28
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Chapter 28 Practice Test
1.
How many molecule orbitals does 1,3,5-hexatriene produce?
2.
Which of the molecular orbitals of 1,3,5-hexatriene are symmetric?
3.
Which of the molecular orbitals of 1,3,5-hexatriene are antisymmetric?
4.
Which are bonding molecular orbitals?
5.
A compound with three double bonds undergoes __________ ring closure under thermal conditions.
6.
A compound with two double bonds undergoes __________ ring closure under photochemical conditions.
7.
A compound with three pairs of electrons in the reacting system undergoes __________ rearrangement
under thermal conditions.
8.
A compound with two pairs of electrons in the reacting system undergoes __________ rearrangement
under photochemical conditions.
9.
[1,5] Sigmatropic hydrogen migration involves _______ pairs of electrons.
10.
A [2
+
2] cycloaddition reaction occurs only under ___________ conditions.