Question 1

Which of the following statements about benzene is correct?

Accepted Answer

Benzene is a planar molecule with delocalized pi-electrons that contribute to its stability. The carbon-carbon bond length in benzene is shorter than that in ethane, as a result of the delocalization of the pi-electrons. The carbon-hydrogen bonds in benzene are also not the same length but are intermediate between single and double bond lengths.

Question 2

Identify the resonance hybrid.

Accepted Answer

D

Question 3

Which of the following statements is incorrect about benzene?

Accepted Answer

All carbon atoms in benzene are actually sp2 hybridized.

Question 4

The delocalized π system in benzene is formed by a cyclic overlap of 6 ________ orbitals.

Accepted Answer

The delocalized π system in benzene is formed by a cyclic overlap of 6 p orbitals.

Question 5

Which of the following pairs are resonance structures?

Accepted Answer

The answer of Which of the following pairs are resonance...

Question 6

In which of the following does resonance delocalization of electron density not play a role?

Accepted Answer

Resonance delocalization of electron density is a concept that applies to molecules or ions where electrons (particularly π electrons) can be distributed over two or more atoms, creating structures that are hybrids of multiple Lewis structures. In the case of the allyl cation, benzyl anion, and the molecules represented by chemical markup (which are not directly interpretable but likely intended to represent molecules with conjugated systems), resonance plays a significant role in stabilizing the species by delocalizing the charge or unpaired electron over several atoms. However, in the case of the cyclohexyl radical, there is no conjugated system present for the delocalization of the unpaired electron; thus, resonance does not play a role in its stabilization.

Question 7

Draw the important resonance contributing forms for the structure shown below.

Accepted Answer

The answer of Draw the important resonance contributing forms for...

Question 8

Due to electron delocalization, one would predict that the carbon-oxygen bond in acetamide, CH₃CONH₂, ________.

Accepted Answer

The answer of Due to electron delocalization, one would predict...

Question 9

Draw the important resonance structure of:

Accepted Answer

The answer of Draw the important resonance structure of: ...

Question 10

Draw the important resonance contributing forms for the structure shown below.

Accepted Answer

The answer of Draw the important resonance contributing forms for...

Question 11

Draw the arrows to go from one resonance structure to another.

Accepted Answer

The answer of Draw the arrows to go from one...

Question 12

Draw the important resonance contributing forms for the structure shown below.

Accepted Answer

The answer of Draw the important resonance contributing forms for...

Question 13

Draw the important resonance structures of:

Accepted Answer

The answer of Draw the important resonance structures of: ...

Question 14

Draw two other resonance contributors for the following compound:

Accepted Answer

The answer of Draw two other resonance contributors for the...

Question 15

Which of the following is not a resonance structure of the species shown?

Accepted Answer

Structure IV has a different arrangement than the others, with the double bond between the nitrogen and oxygen atoms instead of between the carbon and oxygen atoms, making it a different molecule and not a resonance structure of the given species.

Question 16

Draw the important resonance structures of: H₂ N:

Accepted Answer

The answer of Draw the important resonance structures of: H₂ ...

Question 17

Give the hybridization, shape, and bond angle of a carbon in benzene.

Accepted Answer

The answer of Give the hybridization, shape, and bond angle...

Question 18

Mark the most electron-rich carbon atom in the compound below with an asterisk.

Accepted Answer

The answer of Mark the most electron-rich carbon atom in...

Question 19

Does the following structures represent different compounds or resonance contributors?

Accepted Answer

The answer of Does the following structures represent different compounds...

Question 20

Which of the following pairs are resonance structures?

Accepted Answer

The answer of Which of the following pairs are resonance...

Quiz 8: Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Which of the following statements about benzene is correct?

Identify the resonance hybrid.

Which of the following statements is incorrect about benzene?

The delocalized π system in benzene is formed by a cyclic overlap of 6 ________ orbitals.

Which of the following pairs are resonance structures?

In which of the following does resonance delocalization of electron density not play a role?

Draw the important resonance contributing forms for the structure shown below.

Due to electron delocalization, one would predict that the carbon-oxygen bond in acetamide, CH3CONH2, ________.

Draw the important resonance structure of:

Draw the important resonance contributing forms for the structure shown below.

Draw the arrows to go from one resonance structure to another.

Draw the important resonance contributing forms for the structure shown below.

Draw the important resonance structures of:

Draw two other resonance contributors for the following compound:

Which of the following is not a resonance structure of the species shown?

Draw the important resonance structures of: H2 N:

Give the hybridization, shape, and bond angle of a carbon in benzene.

Mark the most electron-rich carbon atom in the compound below with an asterisk.

Does the following structures represent different compounds or resonance contributors?

Which of the following pairs are resonance structures?

Due to electron delocalization, one would predict that the carbon-oxygen bond in acetamide, CH₃CONH₂, ________.

Draw the important resonance structures of: H₂ N: