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Answers to Chapter 28 Practice Test
1.
6
2.
c
1
,
c
3
, and
c
5
3.
c
2
,
c
4
, and
c
6
4.
c
1
,
c
2
, and
c
3
5.
A compound with three double bonds undergoes disrotatory ring closure under thermal conditions.
6.
A compound with two double bonds undergoes disrotatory ring closure under photochemical conditions.
7.
A compound with three pairs of electrons in the reacting system undergoes suprafacial rearrangement
under thermal conditions.
8.
A compound with two pairs of electrons in the reacting system undergoes suprafacial rearrangement
under photochemical conditions.
9.
[1,5] Sigmatropic hydrogen migration involves three pairs of electrons.
10.
A [
2
+
2
] cycloaddition reaction occurs only under photochemical conditions.