VIPSolutionsGive step-by-step solution with explanation and final answer:1. Rank the following compounds in order of increasing []_. 1 has the lowest [], and 4 has the highest []_. 2. Rank the following compounds in order of increasing []__. 1 has the lowest []_,, and 4 has the highest []_.. ly | | | sullen valle
Question:
Give step-by-step solution with explanation and final answer:
1. Rank the following compounds in order of increasing []_. 1
has the lowest [], and 4 has the highest []_.
2. Rank the following compounds in order of increasing []__. 1
has the lowest []_,, and 4 has the highest []_..
ly | | |
sullen valle
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Asked by: Rahul
Created at: 2026-01-26 04:11:50
Asked by: Rahul
Created at: 2026-01-26 04:11:50
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Let's solve each part step by step:
---
## 1. Ranking Compounds by Increasing λ<sub>max</sub>
### **Concept**
λ<sub>max</sub> (wavelength of maximum absorption) increases as the extent of conjugation increases in a molecule. More conjugated double bonds = higher λ<sub>max</sub>.
### **Structures**
Let's identify the conjugation in each compound:
- **Compound 1:** Phenyl-CH=CH-Ph (stilbene, 2 conjugated double bonds)
- **Compound 2:** Cyclohexyl-CH=CH-Ph (1 double bond conjugated to phenyl)
- **Compound 3:** Phenyl-CH=CH-CH=CH-Ph (3 conjugated double bonds)
- **Compound 4:** Cyclohexyl-CH=CH-CH=CH-Ph (2 conjugated double bonds)
### **Conjugation Order**
Let's count the conjugated double bonds:
- **Compound 2:** 1 (lowest)
- **Compound 1:** 2
- **Compound 4:** 2 (but the cyclohexyl group doesn't extend conjugation)
- **Compound 3:** 3 (highest, as both phenyls are connected by two double bonds)
### **Ranking**
Order of increasing λ<sub>max</sub>:
1. **Compound 2** (lowest, least conjugation)
2. **Compound 1** (next, stilbene)
3. **Compound 4** (conjugation through the chain, phenyl at one end)
4. **Compound 3** (highest, longest conjugated system)
**Final Answer:**
**2 < 1 < 4 < 3**
---
## 2. Ranking Compounds by Increasing λ<sub>max</sub> (Substituted Aromatics)
### **Concept**
- Electron-donating groups (EDGs) increase λ<sub>max</sub>.
- Electron-withdrawing groups (EWGs) decrease λ<sub>max</sub>.
- The more strongly donating the group, the higher the λ<sub>max</sub>.
### **Structures**
Let's identify the substituents:
- **Compound 1:** Pyridinium (N+), strong electron-withdrawing group.
- **Compound 2:** N,N-dimethyl aniline (N(CH₃)₂), strong electron-donating group.
- **Compound 3:** Aniline (NH₂), moderately strong electron-donating group.
- **Compound 4:** Pyridine (N), weakly electron-donating or slightly withdrawing.
### **λ<sub>max</sub> Order**
- **Compound 1:** Strong EWG → lowest λ<sub>max</sub>
- **Compound 4:** Pyridine, weak EWG → next lowest
- **Compound 3:** Aniline, moderate EDG → higher
- **Compound 2:** N,N-dimethylaniline, strongest EDG → highest λ<sub>max</sub>
### **Ranking**
Order of increasing λ<sub>max</sub>:
1. **Compound 1** (lowest, strong EWG)
2. **Compound 4**
3. **Compound 3**
4. **Compound 2** (highest, strong EDG)
**Final Answer:**
**1 < 4 < 3 < 2**
---
## **Summary Table**
| Question | Ranking (Lowest λ<sub>max</sub> to Highest) |
|----------|---------------------------------------------|
| 1 | 2 < 1 < 4 < 3 |
| 2 | 1 < 4 < 3 < 2 |
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