1-Bromo butane is heated with alcoholic KOH, the major product obtained is :
trans But-2-ene
cis-2-Butene
1-Ethoxybutane
1-butene
Dehydrohalogenation occurs by E2 mechanism.
2-Bromo-3-methyl butane on treatment with alcoholic KOH forms 2-Methyl-2-butene.The product formed is in accordance with which rule: