Question

The correct stability order of the following species/molecules is:
 

 

• A. \( q>r>p \)
• B. \( r>q>p \)
• C. \( q>p>r \)
• D. \( p>q>r \)

Hint:

Aromatic compounds are particularly stable due to their conjugated \(\pi\)-electron systems that follow Huckel's rule. Anti-aromatic compounds, on the other hand, are unstable, while nonaromatic compounds lack such electron delocalization.

Answer 1

The Correct Option is A

To determine the correct stability order of the given species/molecules, we need to examine factors that contribute to their stability. These factors can include electron distribution, resonance structures, and inductive effects, among others.

Step 1: Analyze Species \( q \)
Species \( q \) has favorable characteristics such as extensive resonance stabilization, which can delocalize charge across the molecule, enhancing its stability.

Step 2: Analyze Species \( r \)
Species \( r \) has some degree of resonance or an inductive effect that provides moderate stabilization, placing it in an intermediate position between \( q \) and \( p \).

Step 3: Analyze Species \( p \)
Species \( p \)  lacks sufficient resonance structures or may even have some electron-withdrawing elements destabilizing the molecule, making it the least stable.

Final Stability Order:
After examining the key factors influencing stability, the correct order is \( q>r>p \), as species \( q \) benefits most from stabilizing effects, followed by \( r \), and then \( p \).