15. Which of the following molecules/ions can be a Lewis acid?
(A) Hexane
(B) Borane
(C) Dinitrogen
(D)
(E) Diethyl ether

1. Please consider which type of atomic orbital is the following wave function belonging to? (A) (B) (C) (D) (E)

2. Which of the following descriptions for atomic structure is incorrect? (A) The 2s orbital has a nodal surface. (B) The angular functions of atomic orbitals determine how the probability changes from point to point at a given distance from the center of the atom. (C) 3d orbitals have no radial nodes. (D) Coulombic energy depends on the number of possible exchanges between two electrons with the same energy and the same spin. (E) There are 3 angular nodes in f orbitals.

3. Please use Slater's rules to determine the effective nuclear charge of a 4s electron of Cu. The effective nuclear charge is (A) 3.55 (B) 3.70 (C) 4.05 (D) 4.20 (E) none of above.

4. About the shape and geometry of molecules, which of the following descriptions is incorrect? (A) The Cl-Sn-CI bond angle in SnCl2 is smaller than 120°. (B) XeF4 is a square planar molecule. (C) In carbonyl fluoride COF2, the F-C-F angle is larger than the O-C-F angle. (D) CIF3 has a T-shaped structure. (E) In XeOF4, no F atom is trans to the O atom.

5. Which of the following geometries is the correct one for SF4? (A) Tetrahedral (B) Seesaw (C) Square planar (D) Square antiprismatic (E) Square pyramidal

6. Which of the following molecules or ions has the same molecular geometry with H2O? (A) (B) CO2 (C) SO2 (D) XeF2 (E)

7. What point group does osmocene Os(C5H5)2 (eclipse) belong to? (A) (B) (C) (D) (E) S5

8. Which of the following molecule belongs to point group? (A) Water H2O (B) Carbon dioxide CO2 (C) Ammonia NH3 (D) Diborane B2H6 (E) Allene H2C=C=CH2

9. Which of the following answers is the correct irreducible representation sum of the reducible representation ? (A)A1+A2+B1+B2(B)2A1+B1+B2(C)3A2+B1(D)A1+2A2+B2(E) A2 +2B1+B2

10. Which of the following descriptions is correct for Mn(CO)5Cl? (A) Mn(CO)5Cl should have five IR-active stretching modes. (B) Mn(CO)5CI should have three IR-active stretching modes from A1. (C) Mn(CO)5CI should have two IR-active stretching modes from E. (D) Mn(CO)5CI should have one IR-active stretching mode from B1. (E) Mn(CO)5Cl should have two IR-inactive stretching modes.

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