The controversy is related to the question of whether the traditional explanation of hyperconjugation is the primary factor governing the stability of alkyl radicals.
ðə kˈɑːntɹəvˌɜːsi ɪz ɹᵻlˈeɪɾᵻd tə ðə kwˈɛstʃən ʌv wˈɛðɚ ðə tɹɐdˈɪʃənəl ɛksplɐnˈeɪʃən ʌv hˌaɪpɚkˌɑːndʒuːɡˈeɪʃən ɪz ðə pɹˈaɪmɚɹi fˈæktɚ ɡˈʌvɚnɪŋ ðə stəbˈɪlᵻɾi ʌv ˈælkaɪl ɹˈædɪkəlz.