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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Transcribed Image Text:**Question 2: Identifying the Diene and Dienophile**
**Instructions:**
Identify the diene and dienophile combination that would result in the provided product.
**Product Structure:**
The product depicted is a bicyclic system with a nitro (NO₂) group and a hydrogen (H) atom attached.
**Choices:**
A) Cyclopentadiene + Nitroethylene (H₂C=CHNO₂)
B) 1,3-Butadiene + Nitropropylene (CH₃CH=CHNO₂)
C) Cyclopentadiene + Nitroethylene (H₂C=CHNO₂)
D) Cyclopentadiene with a nitro group + Ethylene (H₂C=CH₂)
**Graph/Diagram Explanation:**
### Diagrams:
1. **Product:**
A bicyclic compound with one ring containing a substituent NO₂ and another containing an H.
2. **Choices:**
A. **Cyclopentadiene:** A five-membered ring with two double bonds.
**Nitroethylene:** Ethylene with a nitro substituent (H₂C=CHNO₂)
B. **1,3-Butadiene:** A four-carbon chain with two double bonds.
**Nitropropylene:** A three-carbon chain with one double bond and a nitro group (CH₃CH=CHNO₂)
C. **Cyclopentadiene:** A five-membered ring with two double bonds.
**Nitroethylene:** Ethylene with a nitro substituent (H₂C=CHNO₂)
D. **Cyclopentadiene with a nitro group:** A five-membered ring with two double bonds and a nitro substituent.
**Ethylene:** Short carbon chain with a double bond (H₂C=CH₂)
### Concept:
**Diels-Alder Reaction** - A chemical reaction between a conjugated diene and a dienophile to form a cyclohexene system.
To determine the correct combination, one would consider both the structure provided and the reaction mechanism (Diels-Alder cyclization).
Using the detailed reaction analysis for educational purpose:
- The product indicates a bicyclic formation typical of a Diels-Alder reaction.
- The compounds provided in option C closely relate to the structure of a typical diels-alder intermediate.
Hence:
- **Answer
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