According to Zaitsev's rule, what is the major alkene formed during the base-induced E2 elimination of 2-bromobutane?
Answer and explanation
Correct answer: D. 2-butene
Zaitsev's rule states that base-induced elimination predominantly yields the more stable alkene, which is the more substituted one (internal double bond with two alkyl substituents: 2-butene, especially the trans isomer) rather than 1-butene.
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