What is the major product obtained when 2-bromobutane is treated with alcoholic potassium hydroxide (KOH) according to Zaitsev's rule?

💡 Solution & Explanation

Zaitsev rule states that during dehydrohalogenation reactions, the more substituted and stable alkene forms as the major product because hyperconjugation stabilizes it. Other choices like 1-butene are less substituted and form in minor amounts, whereas alcohols are produced via substitution rather than elimination. This specific E2 elimination reaction proceeds efficiently with a strong base in an alcoholic medium. Regioselectivity in elimination is dictated by the relative stability of the resulting double bond.