Question 1

Which hybridization is associated with a tetrahedral electron geometry according to valence bond theory?

Accepted Answer

$$sp^3$$

Question 2

In the molecule shown, what is the electron geometry around the nitrogen atom?

Accepted Answer

Tetrahedral

Question 3

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule shown?

Accepted Answer

12 $$\sigma$$, 1 $$\pi$$

Question 4

Which bond is the shortest and strongest according to the bond data provided?

Accepted Answer

$$C\equiv C$$

Question 5

Why do atomic orbitals hybridize according to valence bond theory?

Accepted Answer

To allow for bonding shapes and angles predicted by VSEPR to be observed

Question 6

Which of the following statements is TRUE regarding central atoms in covalent compounds?

Accepted Answer

Central atoms in covalent compounds employ hybridized orbitals

Question 7

A carbon atom with three regions of electron density around it will have which hybridization?

Accepted Answer

$$sp^2$$

Question 8

Which of the following best describes the bond between the carbon and oxygen in a carbonyl group ($$C=O$$)?

Accepted Answer

One $$\sigma$$ and one $$\pi$$ bond

Question 9

If a molecule has a bond angle of approximately $$109.5^\circ$$, what is its likely electron geometry?

Accepted Answer

Tetrahedral

Question 10

Which of the following is a correct statement about $$\sigma$$ and $$\pi$$ bonds?

Accepted Answer

$$\sigma$$ bonds are stronger than $$\pi$$ bonds

Question 11

Which hybrid orbitals are used by the central carbon in methane ($$CH_4$$)?

Accepted Answer

$$sp^3$$

Question 12

A molecule contains a triple bond between two carbon atoms. What is the hybridization of each carbon in the triple bond?

Accepted Answer

$$sp$$

Question 13

Which of the following best explains why $$C\equiv C$$ bonds are shorter than $$C=C$$ bonds?

Accepted Answer

Triple bonds have more $$\pi$$ bonds, which pull the atoms closer together

Question 14

Which of the following is NOT a characteristic of $$sp^3$$ hybridization?

Accepted Answer

Three hybrid orbitals

Question 15

In the context of valence bond theory, what is the main limitation of using only atomic orbitals for bonding?

Accepted Answer

Atomic orbitals cannot explain observed molecular shapes

Question 16

Which of the following molecules would you expect to have $$sp^2$$ hybridization on the central atom?

Accepted Answer

$$BF_3$$

Question 17

Which of the following best describes the process of hybridization?

Accepted Answer

Mixing of atomic orbitals to form new, equivalent hybrid orbitals

Question 18

Which of the following bonds is expected to have the highest bond energy?

Accepted Answer

$$C\equiv C$$

Question 19

A molecule has a central atom with two regions of electron density. What is the expected hybridization and geometry?

Accepted Answer

$$sp$$, linear

Question 20

Which of the following is a real-world application of understanding hybridization in molecules?

Accepted Answer

Predicting the reactivity and shape of drug molecules in medicinal chemistry

Valence Bond Theory and Hybridization: Lecture 17

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