Question

The major product formed when 2-bromobutane is treated with alcoholic KOH is ______.

Options

• 2-Butanol

• 1-Butene

• 1-Butanol

• trans-2-butene

Answer 1

The major product formed when 2-bromobutane is treated with alcoholic KOH is trans-2-butene.

Explanation:

\[\begin{array}{cc}
\phantom{...}\ce{Br}\phantom{...............................................}\ce{H3C}\phantom{......}\ce{H}\phantom{.}\\
\phantom{..}|\phantom{....................................................}\backslash\phantom{.....}/\phantom{}\\
\ce{\underset{2-bromobutane}{CH3 - CH - CH2 - CH3} ->[alc. KOH] CH3-\overset{⊕}{C}H-CH2-CH3 ->[-H^+] C=C}\phantom{.......}\\
\phantom{.......................................................}/\phantom{.....}\backslash\phantom{.}\\
\phantom{.........................................................}\ce{\underset{trans-2-butene\phantom{..}}{H\phantom{......}CH3}}
\end{array}\]