Question:medium
Choose the correct stability order of the given free radicals.
Choose the correct stability order of the given free radicals.
Show Hint
Free radicals are more stable when they have resonance stabilization and hyperconjugation.
Updated On: Apr 14, 2026
- \(I>II>III>IV\)
- \(II>I>IV>III\)
- \(II = I>IV>III\)
- \(III>IV>II>I \)
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Factors Affecting Free Radical Stability
Free radical stability is determined by: 1. Resonance stabilization
2. Hyperconjugation
3. Inductive effects
Step 2: Stability Assessment of Each Compound
Free radicals (II) and (I) exhibit stabilization through resonance and hyperconjugation.
Free radical (III) is destabilized by the strong electron-withdrawing effect (\(-I\)) of the \(-NO_2\) group.
Free radical (IV) experiences a weaker electron-withdrawing effect from the \(-CN\) group, resulting in greater stability compared to (III).
Step 3: Stability Ranking
The stability order is as follows: \[II>I>IV>III\] Therefore, the correct option is (B).
Free radical stability is determined by: 1. Resonance stabilization
2. Hyperconjugation
3. Inductive effects
Step 2: Stability Assessment of Each Compound
Free radicals (II) and (I) exhibit stabilization through resonance and hyperconjugation.
Free radical (III) is destabilized by the strong electron-withdrawing effect (\(-I\)) of the \(-NO_2\) group.
Free radical (IV) experiences a weaker electron-withdrawing effect from the \(-CN\) group, resulting in greater stability compared to (III).
Step 3: Stability Ranking
The stability order is as follows: \[II>I>IV>III\] Therefore, the correct option is (B).
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