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:### Understanding UV Activity in Organic Structures
#### Question 9 of 30:
**Which of the structures are UV active and expected to absorb radiation between 200 and 400 nm?**
##### Options:
- **A**
- Structure: Cyclohexene
- Characteristics: Contains a single carbon-carbon double bond within a six-membered ring.
- **B**
- Structure: Cyclohexene with an additional isolated double bond
- Characteristics: Six-membered ring structure with two distinct double bonds.
- **C**
- Structure: Benzene
- Characteristics: Aromatic ring with alternating single and double bonds, creating a conjugated system.
- **D**
- Structure: Cyclohexene with a side chain double bond
- Characteristics: Addition of a double bond in a side chain attached to the six-membered ring.
- **E**
- Structure: Cyclohexadiene
- Characteristics: Six-membered ring with two double bonds in a conjugated system.
- **F**
- Structure: Cyclohexene with a side chain double bond
- Characteristics: Similar to D but with a different placement of the side chain containing the double bond.
**Explanation of Graphical Structures:**
1. **A (Cyclohexene):** This structure has one double bond. It is not highly conjugated, thus it may not be very UV active.
2. **B:** Features two double bonds, but they are not in conjugation which lessens UV absorption around the range of 200-400 nm.
3. **C (Benzene):** Exhibits a fully conjugated six-membered ring, making it highly UV active within the specified range.
4. **D:** Contains an additional double bond attached to the cyclohexene ring, might show some UV activity.
5. **E (Cyclohexadiene):** This structure has conjugated double bonds, likely making it UV active.
6. **F:** This structure is similar to D; the non-conjugated addition reduces its likelihood of significant UV absorption within the range.
**Conclusion:**
Of the given structures, **Benzene (C)** and **Cyclohexadiene (E)** are highly likely to be UV active and absorb radiation between 200 and 400 nm due to their conjugated double bonds systems. Structures with isolated double bonds (
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