Can you explain the reasons and concepts for why these answers are true?

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Can you explain the reasons and concepts for why these answers are true?

**Question:**

1. Which of the following compounds is conjugated?

**Diagrams and Options:**

- **I:** A five-membered ring with one double bond.
- **II:** A six-membered benzene ring with three alternating double bonds.
- **III:** A linear chain with two separated double bonds.
- **IV:** A six-membered ring similar to a benzene ring, but with one double bond substituted and a positive charge on an atom.

**Answer Choices:**

- **A.** I
- **B.** II
- **C.** III
- **D.** IV (highlighted)

**Explanation:**

The highlighted choice, **D. IV**, indicates that compound IV is the correct answer as the conjugated compound. This compound retains a conjugated system even with a positive charge present, allowing for electron delocalization across the structure.
Transcribed Image Text:**Question:** 1. Which of the following compounds is conjugated? **Diagrams and Options:** - **I:** A five-membered ring with one double bond. - **II:** A six-membered benzene ring with three alternating double bonds. - **III:** A linear chain with two separated double bonds. - **IV:** A six-membered ring similar to a benzene ring, but with one double bond substituted and a positive charge on an atom. **Answer Choices:** - **A.** I - **B.** II - **C.** III - **D.** IV (highlighted) **Explanation:** The highlighted choice, **D. IV**, indicates that compound IV is the correct answer as the conjugated compound. This compound retains a conjugated system even with a positive charge present, allowing for electron delocalization across the structure.
**Question 2:**

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

**Reaction:**

- Starting Material: A benzene ring with two methyl groups in the ortho position.
- Reagent: HBr (1 equivalent).
- Products: Four structures labeled I, II, III, and IV.

**Structures:**

- **I**: A benzene ring with a bromine atom and two methyl groups adjacent to the bromine.
  
- **II**: A benzene ring with a bromine atom in the para position relative to one of the methyl groups.
  
- **III**: A benzene ring with bromine atoms near both methyl groups.
  
- **IV**: A benzene ring with a bromine atom in the ortho position relative to one of the methyl groups.

**Options:**

- **A.** Only I
- **B.** Only I and II
- **C.** Only II and IV
- **D.** Only I, II, and IV

**Correct Answer:**

- **C.** Only II and IV

*Explanation:* 

The reaction of the benzene derivative with HBr can lead to electrophilic aromatic substitution, and based on directing effects of the methyl groups, positions ortho and para to them are favored. Thus, the major products will be those with bromine at the para or ortho positions relative to the methyl groups, as seen in structures II and IV.
Transcribed Image Text:**Question 2:** What is (are) the major product(s) of the following reaction? **Reaction:** - Starting Material: A benzene ring with two methyl groups in the ortho position. - Reagent: HBr (1 equivalent). - Products: Four structures labeled I, II, III, and IV. **Structures:** - **I**: A benzene ring with a bromine atom and two methyl groups adjacent to the bromine. - **II**: A benzene ring with a bromine atom in the para position relative to one of the methyl groups. - **III**: A benzene ring with bromine atoms near both methyl groups. - **IV**: A benzene ring with a bromine atom in the ortho position relative to one of the methyl groups. **Options:** - **A.** Only I - **B.** Only I and II - **C.** Only II and IV - **D.** Only I, II, and IV **Correct Answer:** - **C.** Only II and IV *Explanation:* The reaction of the benzene derivative with HBr can lead to electrophilic aromatic substitution, and based on directing effects of the methyl groups, positions ortho and para to them are favored. Thus, the major products will be those with bromine at the para or ortho positions relative to the methyl groups, as seen in structures II and IV.
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