$$\text{Bond order} = \frac{\text{number of bonding electrons} - \text{number of antibonding electrons}}{2}$$

Question 1

Which statement best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the end-to-end overlap of atomic orbitals along the internuclear axis.

Question 2

What is the expected hybridization of the central atom in methane ($$CH_4$$)?

Accepted Answer

$$sp^3$$

Question 3

Which of the following molecules has a linear electron geometry?

Accepted Answer

$$CO_2$$

Question 4

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in ethene ($$C_2H_4$$)?

Accepted Answer

5 $$\sigma$$ bonds and 1 $$\pi$$ bond

Question 5

Which hybridization is associated with a trigonal planar electron geometry?

Accepted Answer

$$sp^2$$

Question 6

What is the bond order of $$O_2$$ according to molecular orbital theory?

Accepted Answer

2

Question 7

Which of the following best explains why $$H_2S$$ has a bond angle of approximately $$92.1^	ext{o}$$?

Accepted Answer

The central atom uses $$sp^3$$ hybrid orbitals, but the lone pairs compress the bond angle.

Question 8

Which of the following is true about molecular orbitals?

Accepted Answer

They can be delocalized over several atoms in a molecule.

Question 9

What is the expected hybridization of the central atom in $$BF_3$$?

Accepted Answer

$$sp^2$$

Question 10

Which of the following best describes a pi ($$\pi) $$bond?

Accepted Answer

A bond formed by the side-to-side overlap of two p orbitals above and below the internuclear axis.

Question 11

How many equivalent resonance structures can be drawn for the nitrate ion ($$NO_3$$^-$$)?

Accepted Answer

3

Question 12

Which principle(s) must be considered when filling electrons into molecular orbitals?

Accepted Answer

Aufbau Principle, Pauli Exclusion Principle, and Hund's Rule

Question 13

What is the bond order of $$N_2$$ according to molecular orbital theory?

Accepted Answer

3

Question 14

Which of the following molecules contains both sigma and pi bonds?

Accepted Answer

$$C_2H_4$$

Question 15

Which hybridization is associated with an octahedral electron geometry?

Accepted Answer

$$sp^3d^2$

Question 16

In $$CH_2Cl_2$$, what is the expected hybridization of the carbon atom?

Accepted Answer

$$sp^3$$

Question 17

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 18

What is the bond order formula according to molecular orbital theory?

Accepted Answer

$$	ext{Bond order} = \frac{	ext{number of bonding electrons} - 	ext{number of antibonding electrons}}{2}$$

Question 19

Which molecule has a bond order of zero according to molecular orbital theory?

Accepted Answer

$$He_2$$

Question 20

Which of the following best explains why $$CO_2 is $$nonpolar despite having polar bonds?

Accepted Answer

The molecule has a linear geometry, causing the dipoles to cancel.

CHM.CHP.8

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