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Problem Set 3
Chemistry 173a/268a
Fall 2009
Due: Nov 13, 2009
1) (5 points) (a) Using the ‘project operator’ method generate the SALCs for two H1s orbitals in
D
2h
symmetry.
Show your work.
(b) Check that your SALCs are orthogonal.
C
H1s
H1s
z
x
y
2)
(9 points) (a) Using the point group D
2h
, draw the orbital combinations for
linear
CH
2
and
construct the corresponding MO diagram (N.B. label your molecular orbitals with the appropriate
Mulliken symbols).
When determining the ordering the molecular orbitals assume that all the
antibonding orbitals are higher in energy than any of the bonding or nonbonding orbitals. (b)
How many bonding and antibonding orbitals does CH
2
possess?
(c) Does CH
2
contain any non
bonding orbitals?
If so, why?
(d) Is this molecule diamagnetic or paramagnetic?
3) (5 points) (a) Using the ‘project operator’ method generate the SALCs for two H1s orbitals in
C
2v
symmetry.
Show your work.
(b) Check that your SALCs are orthogonal.
C
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This note was uploaded on 01/09/2011 for the course CHEM 173A taught by Professor Unknown during the Spring '08 term at UCSB.
 Spring '08
 unknown
 Chemistry

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