Both E1 reaction and E2 reaction are more likely to produce 2-methyl-2-butene, instead of 2-methyl-1-butene.Therefore, it makes sense that "2-methyl-2-butene" is the major product while "2-methyl-1-butene" is the minor product because it is not as stable or substituted.
This has happened due of Zaitsev's Rule. Compared to 2-methyl-1-butene, 2-methyl-2-butene's double bond is more heavily replaced. Because it is more stable, 2-methyl-2-butene is more prevalent in the yield. The hydrogen needed to create 2-methyl-2-butene comes from the beta carbon that has undergone the most substitutions. According to Zaitsev's rule, the main product is the one produced as a result of hydrogen being lost during beta distillation, errors being made when weighing and measuring reagents and products, gathering the distillate above 45 C, and alkene products being lost because the alkenes were too close to a heat source. Future investigations should aim to reduce these flaws to obtain more precise results.
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