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Dinesh khalmaniya 1
check this difference
https://chem.libretexts.org/Courses/University_of_Illinois_Springfield/UIS%3A_CHE_267_-_Organic_Chemistry_I_(Morsch)/Chapters/Chapter_08%3A_Alkyl_Halides_and_Elimination_Reactions/810%3A_When_Is_the_Reaction_SN1_SN2_E1_or_E2