17. Which of the following molecules can form hydrogen bonds with other molecules of the same
kind? In each case, briefly explain why or why not. If no hydrogen bonds are present, indicate the
7 predominant interaction. Rank the molecules from lowest (1) to highest (4) boiling point.
H-C-H
H
H-C-N
HH
H
H-C-O
H H
H
H-C-F
H
18. Indicate and draw the molecular orbital that results in each of the following combinations of
atomic orbitals. Indicate the number of nodes in each molecular orbital. (Different shadings
indicate different signs of the wavefunction.)
8-8
8-8
+
+
+
19. Identify and draw the shape of the HOMO or LUMO for each molecule below. Label each orbital
"bonding", "antibonding" or "nonbonding"
HOMO:
LUMO:
-H
CI:
CI:
