Question 1

Which of these ions is aromatic? Assume all structures are planar.

Accepted Answer

D

Question 2

Which of these conditions is not a requirement for aromaticity?

Accepted Answer

The condition of having (4n) π electrons is not a requirement for aromaticity, but instead it is a requirement for anti-aromaticity. Aromatic compounds must have (4n+2) π electrons (where n is an integer).

Question 3

Which of these ions is aromatic?

Accepted Answer

E

Question 4

Which of these structures is aromatic?

Accepted Answer

The answer of Which of these structures is aromatic? 
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Question 5

Which of tiefe following s strucures is cumene?

Accepted Answer

Cumene has the chemical structure of (CH3)2C6H5, which matches the structure in choice B. The other choices do not have the same structure as cumene.

Question 6

Which of the following structures is anisole?

Accepted Answer

The answer of Which of the following structures is anisole?
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Question 7

Which of the following structures is aniline?

Accepted Answer

The answer of Which of the following structures is aniline?
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Question 8

Which of these ions contains  4n π electrons?

Accepted Answer

Iodide ion (I-) has 4n π electrons because it has a lone pair of electrons which forms a π bond with the adjacent σ bond. This results in a total of 4n π electrons.
Nitrate ion (NO3-) has 3 resonance structures, each with a double bond and a single bond. This leads to a total of 6 π electrons. Therefore, it does not have 4n π electrons.
Carbonate ion (CO32-) also has 3 resonance structures, but two have double bonds and one has a single bond. This leads to a total of 4 π electrons. Therefore, it also does not have 4n π electrons.
So, the correct answer is D as only I and III (Iodide and Carbonate ion) have 4n π electrons.

Question 9

Which of the following stucucures is ortho-intoctulene?

Accepted Answer

The answer of Which of the following stucucures is ortho-intoctulene?
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Question 10

Which statement about the π molecular orbitals in benzene is true?

Accepted Answer

In benzene, all the π bonding orbitals are fully occupied, and there are no π nonbonding orbitals. The π molecular orbitals formed from the p orbitals of the carbon atoms result in bonding and antibonding orbitals, but no nonbonding orbitals are present in the structure.

Question 11

Which of the following structures is meta-bromoaniline?

Accepted Answer

The answer of Which of the following structures is meta-bromoaniline?
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Question 12

Which of the following structures is aromatic?

Accepted Answer

The criteria for a molecule to be aromatic is that it must be cyclic, planar, conjugated, and follow Huckel's rule (4n+2 pi electrons, where n is a non-negative integer).

Option I is cyclic, planar, and conjugated, but it has 6 pi electrons, which does not follow Huckel's rule.
Option II is cyclic, planar, and conjugated. It has 6 pi electrons which also does not follow Huckel's rule.
Option III is cyclic, planar, and conjugated. It has 10 pi electrons which follows Huckel's rule.
Option IV is cyclic, planar, and conjugated. It has 8 pi electrons which does not follow Huckel's rule.
Option V is not cyclic, so it cannot be aromatic.

Therefore, the structures that meet the criteria for being aromatic are I, III, and IV. Hence, the correct answer is B.

Question 13

Which of the following is not aromatic?

Accepted Answer

The answer of Which of the following is not aromatic?

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Question 14

The heat of hydrogenation of benzene is

Accepted Answer

The answer of The heat of hydrogenation of benzene is...

Question 15

With regard to  electrons, which of the following structures is not isoelectronic with the others?

Accepted Answer

The answer of With regard to  electrons, which of...

Question 16

In the bridged structure shown below, what are the most likely  1H  NMR chemical shifts (in ppm) for  , respectively?

Accepted Answer

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Question 17

Which of the following statements is false?

Accepted Answer

Benzene's structure is characterized by a ring of six carbon atoms with alternating single and double bonds. However, due to resonance, all carbon-carbon bonds in benzene are of equal length, making the statement that they have different lengths false.

Question 18

Which is a Dewar resonance form of benzene?

Accepted Answer

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Question 19

Which of these structures is not aromatic?

Accepted Answer

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Question 20

Which of the following ions is not aromatic? Assume all structures are planar

Accepted Answer

The answer of Which of the following ions is not...

Quiz 14: Aromaticity