Question 1

Which type of bond is formed by the side-to-side overlap of two parallel p orbitals, as shown in the molecular orbital diagrams for double and triple bonds?

Accepted Answer

A pi ($$\pi) $$bond

Question 2

In the molecule ethyne ($$\mathrm{C_2H_2}$$), what is the hybridization of each carbon atom?

Accepted Answer

$$sp$$

Question 3

Which of the following statements best explains why rotation around a double bond is restricted?

Accepted Answer

Double bonds contain a $$\pi$$ bond, which requires parallel p orbitals that cannot rotate without breaking the overlap.

Question 4

How many $$\sigma$$ and $$\pi$$ bonds are present in the molecule formaldehyde ($$\mathrm{CH_2O}$$)?

Accepted Answer

3 $$\sigma$$ bonds and 1 $$\pi$$ bond

Question 5

Which hybridization scheme is associated with a tetrahedral electron geometry and a bond angle of approximately $$109.5^\circ$$?

Accepted Answer

$$sp^3$$

Question 6

According to molecular orbital theory, what is the bond order of $$\mathrm{O_2$}$$?

Accepted Answer

$$2$$

Question 7

Which of the following molecules is predicted to be paramagnetic based on its molecular orbital diagram?

Accepted Answer

$$\mathrm{O_2$}$$

Question 8

What is the total number of atomic orbitals that combine to form the molecular orbitals in a $$\mathrm{B_2$}$$ molecule?

Accepted Answer

6

Question 9

Which of the following best describes the difference between valence bond theory and molecular orbital theory?

Accepted Answer

Valence bond theory describes bonds as the overlap of atomic orbitals, while molecular orbital theory describes bonds as electrons occupying molecular orbitals formed from atomic orbitals.

Question 10

A molecule has a trigonal bipyramidal electron geometry. What is the hybridization of the central atom?

Accepted Answer

$$sp^3d$

Question 11

Which of the following species has the strongest bond according to molecular orbital theory?

Accepted Answer

$$\mathrm{H_2$}$$

Question 12

What is the bond order of $$\mathrm{C_2$}$$ according to its molecular orbital diagram?

Accepted Answer

2

Question 13

Which of the following statements about hybrid orbitals is correct?

Accepted Answer

Hybrid orbitals are formed by combining atomic orbitals on the same atom.

Question 14

In benzene ($$\mathrm{C_6H_6}$$), the $$\pi$$ electrons are best described as:

Accepted Answer

Delocalized over all six carbon atoms

Question 15

Which of the following molecules contains an atom with $$sp^3d^2$ hybridization?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 16

A molecule has a bond order of zero according to molecular orbital theory. What does this imply about the molecule?

Accepted Answer

The molecule does not exist under normal conditions.

Question 17

Which orbitals overlap to form the $$\sigma$$ bond in the $$\mathrm{H_2$}$$ molecule?

Accepted Answer

Two $$1s$$ orbitals

Question 18

Which of the following best describes the electron configuration of the central atom in methane ($$\mathrm{CH_4$}) $$after hybridization?

Accepted Answer

Four electrons in four $$sp^3$$ hybrid orbitals

Question 19

Which of the following is a consequence of the presence of a $$\pi$$ bond in a molecule?

Accepted Answer

Restricted rotation around the bond axis

Question 20

Which of the following statements about molecular orbitals is correct?

Accepted Answer

The number of molecular orbitals formed equals the number of atomic orbitals combined.

Chemical Bonding II: Valence Bond Theory & Molecular Orbital Theory

Study Guide - Practice Questions

Study Guide - Flashcards