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Chapter 8 303
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6.
Which of the following dienes can be used in a Diels–Alder reaction?
7.
Which is a stronger base?
a.
NH
2
CH
2
O
−
NH
2
O
−
or
or
b.
8.
Draw resonance contributors for each of the following:
a.
NH
2
b.
NH
3
+
c.
O
−
9.
Which resonance contributor makes a greater contribution to the resonance hybrid?
a.
O
−
O
−
or
b.
CH
3
+
CH
3
+
or
10.
Indicate whether each of the following statements is true or false.
a.
A compound with four conjugated double bonds has four molecular orbitals.
T F
b.
c
1
and
c
2
are symmetric molecular orbitals.
T F
c.
If
c
3
is the HOMO in the ground state,
c
4
will be the HOMO in the excited state.
T F
d.
If
c
3
is the LUMO,
c
4
will be the HOMO.
T F
e.
If the ground-state HOMO is symmetric, the ground-state LUMO will be antisymmetric. T F