VIPSolutions9) Which among the following is aromatic? TEN i N { N nN = Or N? Ww, 0 wd 1 2 3 4 [a] 3 [E] 1 BE 4 [4d] 2
Question:
9)
Which among the following is aromatic?
TEN i N {
N nN = Or N?
Ww, 0 wd
1 2 3 4
[a] 3
[E] 1
BE 4
[4d] 2
This is AI generated Response.
Asked by: Test User 100256
Created at: 2025-05-17 13:16:49
Asked by: Test User 100256
Created at: 2025-05-17 13:16:49
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To determine which compound is aromatic, let's recall the rules for aromaticity (Hückel's rule):
1. The molecule must be **cyclic** and **planar**.
2. Every atom in the ring must have a **p orbital** (so the ring is fully conjugated).
3. The molecule must have **(4n + 2) π electrons**, where n is a non-negative integer.
Let's briefly analyze each compound:
1. **Compound 1:** Has 4 π electrons (not aromatic, because it doesn't satisfy Hückel's rule; 4 is not 4n+2).
2. **Compound 2:** Contains 6 π electrons (aromatic), but has an sp³ oxygen which disrupts planarity and conjugation.
3. **Compound 3:** This is adenine (a purine base). The five-membered ring in adenine has conjugation and 6 π electrons (aromatic).
4. **Compound 4:** Has 4 π electrons (not aromatic, because 4 ≠ 4n+2).
**Correct answer:**
- **a) 3** (Compound 3 is aromatic)
So, the aromatic compound among the given options is **option 3**.
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