Chemistry 312
Problem Set 3
(Due Friday, July 15, 2011)
1. Assign the following molecule to their appropriate
point groups
; also include a sketch
of the molecule that shows the
symmetry elements
for each molecule, justifying the
choice of point group.
a. CH
2
Cl
2
b. BFClBr
c. NCCN
d. 1,2,3trichlorobenzene
e. 1,2,4trichlorobenzene
f. ICl
4
–
g. adamantane (shown below – all four faces equivalent)
h. ferrocene
2. Examine the D
4h
character table in resource section 4 in the textbook.
a. Give the term (Mulliken) symbol for the irreducible representation for which z is a
basis. Show, through a series of sketches, how the characters for the row that represents
the irreducible representation for which z is a basis.
b. Give the term (Mulliken) symbol for the irreducible representation for which R
z
is a
basis. Show, through a series of sketches, how the characters for the row that represents
the irreducible representation for which R
z
is a basis.
3. Consider the molecule MnO
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 Summer '08
 Staff
 Mole, Rz, irreducible representation, symmetric stretching vibration

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