Within the simple alpha- C − H hyperconjugation model, which alkylbenzene has the largest number of adjacent C − H bonds available for donation into the phenyl ring?

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Under the source's hyperconjugation model, the methyl group of toluene supplies three adjacent C − H bonds. Ethyl, isopropyl and tert-butyl supply two, one and zero respectively. Toluene therefore has the largest hyperconjugative donation to the ring. This is a comparison within that model, not a general quantitative electron-density measurement.

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