Question

The major product formed when 2 – bromo – 2 – methyl butane is refluxed with ethanolic KOH is ______.

Options

• 2 – methylbut – 2- ene

• 2 – methyl butan – 1 – ol

• 2 – methyl but – 1 – ene

• 2 – methyl butan – 2- ol

Answer 1

The major product formed when 2 – bromo – 2 – methyl butane is refluxed with ethanolic KOH is 2 – methylbut – 2- ene.

Explanation:

Refluxing 2-bromo-2-methylbutane with ethanolic KOH gives elimination (dehydrohalogenation), and the more substituted (Zaitsev) alkene is the major product. So the major product is:

2–methylbut–2–ene