Question 1

Draw the HOMO of 1,3,5-hexatriene.

Accepted Answer

The answer of Draw the HOMO of 1,3,5-hexatriene....

Question 2

Consider the hydrogenation reaction of each compound listed and rank the compounds in order of increasing ΔH° of this reaction.The most negative ΔH° should be listed first.
2,5-dimethyl-1,3-cycloheptadiene,
1,4-dimethyl-1,3-cycloheptadiene,and
3,6-dimethyl-1,4-cycloheptadiene

Accepted Answer

The answer of Consider the hydrogenation reaction of each compound...

Question 3

Which of the following is the weakest base?

Accepted Answer

The acetate ion is the weakest base among the options given because it has resonance stabilization when it accepts a proton, making it less likely to act as a base compared to the other options which are less stabilized or more reactive as bases.

Question 4

Consider the hydrogenation reaction of each compound listed and rank the compounds in order of increasing ΔH° of this reaction.The most negative ΔH° should be listed first.
cis-2-pentene,2,3-pentadiene,and trans-1,3-pentadiene

Accepted Answer

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Question 5

Which of the following is/are the major product(s)of the following reaction?

Accepted Answer

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Question 6

Which species is represented by the following distribution of π electrons in the molecular orbitals and energy levels diagram?

Accepted Answer

The diagram shows 6 π electrons distributed in three molecular orbitals. This is the characteristic distribution for a species with a planar, cyclic structure and a conjugated π system. Only option III satisfies these criteria. Option I has 8 π electrons and is therefore not conjugated, and options II, IV, and V have non-planar structures that do not allow for conjugation.

Question 7

Which π MOs are bonding MOs in the ground state of 1,3,5-hexatriene?

Accepted Answer

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Question 8

Which of the following is the strongest acid?

Accepted Answer

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Question 9

Draw the LUMO of 1,3,5-hexatriene.

Accepted Answer

The answer of Draw the LUMO of 1,3,5-hexatriene....

Question 10

Show how the p orbitals overlap to form the nonbonding π molecular orbital of the allyl system.

Accepted Answer

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Question 11

Identify the most stable carbocation.

Accepted Answer

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...

Question 12

Indicate the compound that has the shortest bond length between the two middle carbon atoms.

Accepted Answer

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Question 13

Provide a diagram which depicts the relative energies of the π molecular orbitals of benzene.Show which molecular orbitals are filled in benzene's ground state.

Accepted Answer

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Question 14

Which of the following is the strongest acid?

Accepted Answer

The answer of Which of the following is the strongest...

Question 15

Identify the most stable carbocation.

Accepted Answer

The answer of Identify the most stable carbocation.
...

Question 16

Excluding the horizontal node which is coincident with the molecular plane,how many nodes are present in Ψ₄ of the 1,3,5-hexatriene π system?

Accepted Answer

Ψ₄ of the 1,3,5-hexatriene π system has 3 nodes, excluding the horizontal node coincident with the molecular plane.

Question 17

Provide the structure of the major organic product(s)in the reaction below.

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Question 18

Arrange the following unsaturated hydrocarbons in order of decreasing reactivity toward HBr addition.

Accepted Answer

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Question 19

Which of the following ions is most acidic?

Accepted Answer

The presence of the sulfuric acid group (-SO3H) makes ion A the most acidic as it can release H+ ions more easily. The other options have weaker acid groups or lack them altogether.

Question 20

In the molecular orbital representation of benzene,how many π molecular orbitals are present?

Accepted Answer

Benzene has 6 π molecular orbitals, resulting from the combination of one p orbital from each of the six carbon atoms in the ring.

Quiz 8: Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Draw the HOMO of 1,3,5-hexatriene.

Consider the hydrogenation reaction of each compound listed and rank the compounds in order of increasing ΔH° of this reaction.The most negative ΔH° should be listed first. 2,5-dimethyl-1,3-cycloheptadiene, 1,4-dimethyl-1,3-cycloheptadiene,and 3,6-dimethyl-1,4-cycloheptadiene

Which of the following is the weakest base?

Consider the hydrogenation reaction of each compound listed and rank the compounds in order of increasing ΔH° of this reaction.The most negative ΔH° should be listed first. cis-2-pentene,2,3-pentadiene,and trans-1,3-pentadiene

Which of the following is/are the major product(s) of the following reaction?

Which species is represented by the following distribution of π electrons in the molecular orbitals and energy levels diagram?

Which π MOs are bonding MOs in the ground state of 1,3,5-hexatriene?

Which of the following is the strongest acid?

Draw the LUMO of 1,3,5-hexatriene.

Show how the p orbitals overlap to form the nonbonding π molecular orbital of the allyl system.

Identify the most stable carbocation.

Indicate the compound that has the shortest bond length between the two middle carbon atoms.

Provide a diagram which depicts the relative energies of the π molecular orbitals of benzene.Show which molecular orbitals are filled in benzene's ground state.

Which of the following is the strongest acid?

Identify the most stable carbocation.

Excluding the horizontal node which is coincident with the molecular plane,how many nodes are present in Ψ₄ of the 1,3,5-hexatriene π system?

Provide the structure of the major organic product(s)in the reaction below.

Arrange the following unsaturated hydrocarbons in order of decreasing reactivity toward HBr addition.

Which of the following ions is most acidic?

In the molecular orbital representation of benzene,how many π molecular orbitals are present?

Quiz 8: Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Draw the HOMO of 1,3,5-hexatriene.

Consider the hydrogenation reaction of each compound listed and rank the compounds in order of increasing ΔH° of this reaction.The most negative ΔH° should be listed first. 2,5-dimethyl-1,3-cycloheptadiene, 1,4-dimethyl-1,3-cycloheptadiene,and 3,6-dimethyl-1,4-cycloheptadiene

Which of the following is the weakest base?

Consider the hydrogenation reaction of each compound listed and rank the compounds in order of increasing ΔH° of this reaction.The most negative ΔH° should be listed first. cis-2-pentene,2,3-pentadiene,and trans-1,3-pentadiene

Which of the following is/are the major product(s) of the following reaction?

Which species is represented by the following distribution of π electrons in the molecular orbitals and energy levels diagram?

Which π MOs are bonding MOs in the ground state of 1,3,5-hexatriene?

Which of the following is the strongest acid?

Draw the LUMO of 1,3,5-hexatriene.

Show how the p orbitals overlap to form the nonbonding π molecular orbital of the allyl system.

Identify the most stable carbocation.

Indicate the compound that has the shortest bond length between the two middle carbon atoms.

Provide a diagram which depicts the relative energies of the π molecular orbitals of benzene.Show which molecular orbitals are filled in benzene's ground state.

Which of the following is the strongest acid?

Identify the most stable carbocation.

Excluding the horizontal node which is coincident with the molecular plane,how many nodes are present in Ψ4 of the 1,3,5-hexatriene π system?

Provide the structure of the major organic product(s)in the reaction below.

Arrange the following unsaturated hydrocarbons in order of decreasing reactivity toward HBr addition.

Which of the following ions is most acidic?

In the molecular orbital representation of benzene,how many π molecular orbitals are present?

Excluding the horizontal node which is coincident with the molecular plane,how many nodes are present in Ψ₄ of the 1,3,5-hexatriene π system?