1. Molecular Geometry and Bonding Theories
Chemistry: The Central Science, 10th edition
Theodore L. Brown, H. Eugene LeMay, Jr., and Bruce E. Bursten
Chapter 9
Molecular Geometry and Bonding Theories
Todd Austell, The University of North Carolina
 2006, Pearson Prentice Hall

2. trigonal planar
tetrahedral
trigonal bipyramidal
octahedral

3. trigonal planar
tetrahedral
trigonal bipyramidal
octahedral

4. No, there are 10 electrons around A.
Yes, there are 8 electrons around A.

5. No, there are 10 electrons around A.
Yes, there are 8 electrons around A.

6. No, the double bond should squeeze the bond angle between single bonds to less than 120°.
Yes, resonance equalizes repulsions between bonds, making all angles 120°.

7. No, the double bond should squeeze the bond angle between single bonds to less than 120°.
Yes, resonance equalizes repulsions between bonds, making all angles 120°.

8. No
Yes

9. No
Yes
Au – order of yes and no switched to remain consistent with preceding question. OK?

10. Yes No

11. Yes No

12. No, they would not be equivalent.
Yes, they’d be equivalent and we’d expect the bond angles to be 90°.
Yes, they’d be equivalent and we’d expect the bond angles to be 109.5°.
Yes, they’d be equivalent and we’d expect the bond angles to be 180°.

13. No, they would not be equivalent.
Yes, they’d be equivalent and we’d expect the bond angles to be 90°.
Yes, they’d be equivalent and we’d expect the bond angles to be 109.5°.
Yes, they’d be equivalent and we’d expect the bond angles to be 180°.

14. The unhybridized p-orbital is 180° from the plane of the sp2 orbitals.
The unhybridized p-orbital is coplanar with the plane of the sp2 orbitals.
The unhybridized p-orbital is 109.5° from the plane of the sp2 orbitals.
The unhybridized p-orbital is perpendicular to the plane of the sp2 orbitals.

15. The unhybridized p-orbital is 180° from the plane of the sp2 orbitals.
The unhybridized p-orbital is coplanar with the plane of the sp2 orbitals.
The unhybridized p-orbital is 109.5° from the plane of the sp2 orbitals.
The unhybridized p-orbital is perpendicular to the plane of the sp2 orbitals.

16. The molecule is both linear and planar.
The molecule is not linear but is planar.
The molecule is linear but not planar.
The molecule is neither linear nor planar.

17. The molecule is both linear and planar.
The molecule is not linear but is planar.
The molecule is linear but not planar.
The molecule is neither linear nor planar.

18. The H atoms would remain bonded to one another.
The molecule would fall apart.

19. The H atoms would remain bonded to one another.
The molecule would fall apart.

20. Bond order is 0.
Bond order is 1/2.
Bond order is 1.
Bond order is 3/2.

21. Bond order is 0.
Bond order is 1/2.
Bond order is 1.
Bond order is 3/2.

22. Yes No

23. Yes No

24. Yes No
NEED FIGURE 9.45?

25. Yes No