6. Use VSEPR theory to predict the ideal bond angles around the two carbon atoms in
acetaldehyde, CH
3
CHO. (The first carbon has single bonds to three H atoms and one C
atom; the second carbon has single bonds to C and H, and a double bond to O.)
a.
109°, 109°
b.
109°, 120°
c.
120°, 109°
d.
120°, 90°
e.
105°, 105°
7. In a carbon-carbon triple bond, what is the nature of the bonding between the carbons?
a.
two 2
s
orbitals overlapping
b.
two 2
p
orbitals overlapping
c.
two
sp
orbitals overlapping, two 2
p
y
overlapping and two 2
p
z
overlapping
d.
an
sp
and
sp
2
overlapping and 2
p
orbitals overlapping
e.
an
sp
2
and
sp
2
overlapping and 2
p
orbitals overlapping
8. Which of the following molecules has
sp
3
hybridization and a dipole moment?
a.
SiH
4
b.
BF
3
c.
NH
3
d.
BrF
3
e.
PCl
5
9. In the molecular orbital description of bonding in benzene (C
6
H
6
), how many electrons
occupy delocalized MOs?
a. 2
b. 3
c. 4
d. 5
e. 6
10. In which of the following species is the octet rule violated by the central atom?
a. CH
4
b. SF
4
c. PCl
4
+
d. SO
2
e. NH
3