CHEM 177 SI- DR. HOLME’S SECTIONS
TINA AKINYI
1. What is the hybridization of the carbon atoms in benzene, C6H6?
a.
b.
c.
d.
e.
sp
sp2
sp3
sp3d
sp3d2
2. What hybridization change does the carbon atom undergo in the combustion of methane?
CH4(g) + 2O2(g) CO2(g) + 2H2O(g)
a.
b.
c.
d.
e.
3.
sp sp2
sp2 sp3
sp3 sp
sp2 sp
none
How many sigma and pi bonds are present in the following molecule?
a.
b.
c.
d.
e.
4.
8 sigma bonds and 1 pi bond
8 sigma bonds and 2 pi bonds
10 sigma bonds and 2 pi bonds
11 sigma bonds and 2 pi bonds
11 sigma bonds and 1 pi bond
Label the hybridization at C#1, C#2, C#3, and C#4 in the molecule.
C1
a.
b.
c.
d.
e.
sp
sp
sp
sp2
sp3
C2
sp
sp
sp2
sp2
sp3
sp3
sp2
sp2
sp3
sp3
C3
C4
sp3d
sp3
sp2
sp3
sp3
11/11/2015
TINA AKINYI
CHEM 177 SI- DR. HOLME’S SECTIONS
5. How many sigma () bonds and pi () bonds are in the following molecule?
a.
b.
c.
d.
e.
6.
five and two 
five and three 
five and five 
seven and two 
seven and three 
Which of the following characteristics apply to PCl3?
1.
2.
3.
4.
nonpolar molecule
polar bonds
trigonal-pyramidal molecular geometry
sp2 hybridized
a.
b.
c.
d.
e.
1 and 2
2 and 3
3 and 4
1, 2, and 3
1, 2, 3, and 4
7. Which of the underlined atoms (C1, C2, N, and O) are sp2 hybridized?
a.
b.
c.
d.
e.
C1 and C2
C1, N, and O
N and O
O and C2
O only
11/11/2015
CHEM 177 SI- DR. HOLME’S SECTIONS
TINA AKINYI
11/11/2015
Molecular Orbital Theory
The following molecular orbital diagram may be used for the following problems. For oxygen and fluorine,
the 2p orbital should be lower in energy than the 2p. However, the diagram will still yield correct bond order
and magnetic behavior for these molecules.
8. According to molecular orbital theory, which of the following species is the most likely to exist?
a.
b.
c.
d.
H22He2
Li2
Be2
*We will discuss bonding/antibonding in tomorrow’s SI session*
TINA AKINYI
CHEM 177 SI- DR. HOLME’S SECTIONS
11/11/2015
TINA AKINYI
CHEM 177 SI- DR. HOLME’S SECTIONS
11/11/2015