Carbocation Stability (3° > 2° > 1° > methyl for alkyl; resonance-stabilized (allylic/benzylic) even higher)
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3° > 2° > 1° > methyl for alkyl; resonance-stabilized (allylic/benzylic) even higher
What each symbol means
| Symbol | What it stands for |
|---|---|
| +I | Alkyl donation |
| resonance | π delocalization |
| hyperconjugation | α-H overlap |
When to use this
Gas-phase vs solution can tweak orders slightly; exams use textbook organic trends.