The correct stability order of the following species/molecules is:
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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.
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 \( p \).
