Review Problems

2. Within one principal quantum level of a many-electron atom, which orbital has the minimum energy?

   1. s
   2. p
   3. d
   4. f

3. Which of the following compounds possesses at least one σ bond?

   1. CH₄
   2. C₂H₂
   3. C₂H₄
   4. All of the above

4. In a double-bonded carbon atom

   1. hybridization between the s orbital and one p orbital occurs.
   2. hybridization between the s orbital and two p orbitals occurs.
   3. hybridization between the s orbital and three p orbitals occurs.
   4. no hybridization occurs between the s and p orbitals.

5. The hybridizations of the carbon atom and the nitrogen atom in the ion CN⁻ are

   1. sp³ and sp³, respectively.
   2. sp³ and sp, respectively.
   3. sp and sp³, respectively.
   4. sp and sp, respectively.

6. Which of the following hybridizations does the Be atom in BeH₂ assume?

   1. sp
   2. sp²
   3. sp³
   4. None of the above

7. Two atomic orbitals combine to form:

   1. a bonding molecular orbital.
   2. an antibonding molecular orbital.
   3. new atomic orbitals.
   1. I only
   2. I, II, and III
   3. III only
   4. I and II only

8. Molecular orbitals can contain a maximum of

   1. 1 electron.
   2. 2 electrons.
   3. 4 electrons.
   4. 2n² electrons, where n is the principal quantum number of the combining atomic orbitals.

9. π bonds are formed by which of the following orbitals?

   1. Two s orbitals
   2. Two p orbitals
   3. One s and one p orbital
   4. All of the above

10. How many σ bonds and π bonds are present in the following compound?

    

    1. 6 σ bonds and 1 π bond
    2. 6 σ bonds and 2 π bonds
    3. 7 σ bonds and 1 π bond
    4. 7 σ bonds and 2 π bonds

11. The four C−H bonds of CH₄ point toward the vertices of a tetrahedron. This indicates that the hybridization of a carbon atom is

    1. sp.
    2. sp².
    3. sp³.
    4. none of the above.