Chem231 - Inorganic -problem set 1.

LEVEL 1 PROBLEMS

**1. **Point group of is-Cu(H2O)4Cl2 is C2v.

**2**.a) Point group is C2v.

b) Atoms
Cla and Clb are equivalent by the C2 axis and by the blue mirror plane.The same is true for equivalent Hb's. *click for labeled structure.*

**3. **(a) Trans isomer is C2h while the cis isomer is C2v

(b) C3h

**4.** (a) Adding a perpendicular C2 to a C5 automatically adds a total of 5 C2 axes; this set of oeprations produces teh D5 point group ( no mirrors were added to make D5d nor D5h!)

(b) When one mirror plane is removed from C4v, a total of 4 vertical mirrors are removed; all that remains is C4.

LEVEL 2 PROBLEMS

**1. **Adamantane has the same
symmetry as methane! Td = tetrahedral. *click for structure with symmetry operations*

**2**. A, D and E have the same point symmetry: D3h.

B and C have the same point symmetry: D3d (you did C in the symmetry workshop).

**3. **(a) this will surprise you: Th !!! (b) Td !!! The secret is to see the C3 axes at the vertices in both structures. Click to see.