Inductive effect and hyperconjugation are permanent polarizations, while resonance involves delocalization of π-electrons. Resonance generally has the strongest influence on stability and reactivity in conjugated systems. But from my bench, I see hyperconjugation's subtle, steady role in stabilizing transition states during synthesis as equally vital for a drug's final shape. It reminds me of how my father's quiet, consistent methods at our masala shop built a deeper loyalty than any flashy new competitor.
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