$CH X_{3} - CH X_{2} - CH (Br) - CH X_{3}$ (2-bromobutane) is heated with alcoholic $KOH$ . The major product is

Abuta-1,3-diene
Bbut-2-ene
Cbutan-2-ol
Dbut-1-ene

Answer: B

Alcoholic

KOH

brings about dehydrohalogenation (E2). By the Saytzeff rule the more substituted (more stable) alkene predominates. But-2-ene is disubstituted while but-1-ene is monosubstituted, so but-2-ene is the major product.

Practice Organic Reaction Mechanisms IV: Elimination More on Saytzeff vs Hofmann products

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Answer: B

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$CH X_{3} - CH X_{2} - CH (Br) - CH X_{3}$ (2-bromobutane) is heated with alcoholic $KOH$ . The major product is